Yenya's World

Tue, 29 Nov 2005

Installed OS: Linux

We have ordered a new CPUs and mainboards for the IS MU application cluster. The mainboard is Tyan Tiger or something like that. I have checked all BIOS settings, and found the most interesting one:

It reads: "Installed O/S:" with the following choices: "Other", which is the default, and "Linux". I don't know whether this is a good sign of Linux being the mainstream OS, heavily supported by Tyan, or a bad sign of Linux having some incompatibility with this board.

ASUS cooler

The upgraded box also has the above monster cooler from ASUS, which looks like a beer barrel bitten by a blue-LED-equipped radioactive spider (image taken from the ASUS web site).

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Mon, 28 Nov 2005

Bugs, Bugs, Bugs

In the last few days I have been hunting bugs in various programs:

The evince document viewer displays incorrectly some PDF documents, including the monthly bulletin of our univeristy. It is tracked (with screenshots) in the GNOME bugzilla as #322118, and in the fd.o bugzilla as #5149.

The kernel and upgrade at Odysseus caused something strange in the kswapd - sometimes when running a fulltext indexing of the mailing lists archives both kswap-daemons are eating too much CPU. It can be seen in the CPU usage graph:

CPU usage graph

... at the end of week 45 the new kernel and bigger memory has been installed. This is tracked in this message to linux-kernel list and the following thread.

I wrote about IP conntrack testing on our filtering router. Now it seems that the conntrack module leaks connections, because the number of connections tracked has been steadily increasing since then:

connections tracked

I have not reported this yet, though.

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Fri, 25 Nov 2005

Music Player Daemon

For a long time, I wanted to replace XMMS (the Ogg/MP3/... audio player for UNIX/X) with something better. XMMS has some serious flaws:

I had a wishlist (in Czech, sorry) of features for my new music player. I sent it to the local Linux mailing list, and someone pointed me to the Music Player Daemon. It is an excellent application - it runs as a daemon, which indexes the whole audio file repository on your computer, and plays the music on background. It can be controlled remotely over the TCP (even with authentication), and has various clients including a command-line client, GNOME client, and so on. When running a system-wide mpd, the music playing survives even your logging off and on. It is suitable even for my home dual-headed and dual-footed setup.

I have created MPD RPM packages for Fedora (the clients are available from Fedora Extras). Later I found out that even the daemon RPMs exist - they are in the rpm.livna.org repository (they cannot be in Extras because of the MP3 support).

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Tue, 22 Nov 2005

Storing 2^256 bits

There was a thread about the implications of 128-bit indexing in Sun's ZFS in the linux-kernel mailing list. In particular, one post in that thread was very interesting: How big device would you need to store 2^128 bits (or even 2^256 bits) of data?

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Fri, 18 Nov 2005

Uptime: 92 minutes

Last Saturday I have installed additional 4 GB of memory to Odysseus. I have also recompiled the new kernel and checked the BIOS settings. The kernel booted OK, but when I returned home in the evening, I got SMS that Odysseus has crashed.

I logged in and Odysseus was up, with uptime 1 minute or so. I have cofigured GRUB so that next time it would boot to the older kernel. During the night I received two or three more messages that Odysseus was down. I tried to limit the amount of memory used back to the original 4 GB. Even then Odysseus keeped crashing.

I connected the serial console through script(1) command in order to catch all messages from the possible system crash. Nothing appeared - the server just silently rebooted after some time. I thought about removing the new 4 GB of memory, but the memory has been thoroughly tested in other box for the last two weeks, so it definitely was not bad.

After some time I tried to look up the exact times of system crashes using last(1), and guess what - the server was rebooted after about 92 minutes each time. So including the time for BIOS startup, it seemed that it rebooted after 90 minutes of Linux uptime. I reverted some changes in BIOS setup (disabled ACPI HPET timer, disabled the ACPI 2.0 support, disabled ECC BG scrub and few other ECC settings), and the problem was fixed. I am not sure which settings was the cause of the problem, though, and I don't have time to play with it now.

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Thu, 17 Nov 2005

Back to Sawfish

I have been using Sawfish as a window manager of choice on all my workstation except the main workstation at work, which is AMD64 dual-head, and I had problems running it on this setup.

On Monday we have discussed with Oozy the features of our desktop environments, and I have decided to give Sawfish another try. Sawfish is an extensible window manager partly written (and configured) in Lisp (yes, those fscking parentheses :-). Since Sawfish project did not make a release in two years or so, I have decided to compile the CVS version. The packages for Fedora 4 (SRPMs and AMD64 binary RPMs) are in my FTP directory.

It works except few minor glitches (sawfish-ui crashing), and now I can have Galeon fixed at workspace 1 of the second head (metacity did not support that or it did not work in it), Liferea on Workspace 4 of the second head, Mutt window without decorations, etc. The workspace switching works correctly (unlike metacity, which has this 2+ years old unfixed bug.

I have to add an usability rant: why there are so many window manager themes with the following flaw: the focus of the window is shown only by changing the title bar (default theme in Fedora, sawfish's microGUI theme, etc.). When the window is partly obscured, it cannot be seen whether it is active or not, or even which window is active (unless you use the brain-dead approach of "the focused window is always on top", of course).

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oozy wrote: hmm Lisp :)

Oooh sawfish in Lisp, this is really interesting. I should keep an eye on it. (You know my Lisp/FP obsession ;)

Jakub Steiner wrote:

For extra crack that sawfish provides, you can look at devil's pie, a metacity companion -- http://www.burtonini.com/blog/computers/devilspie. It may have what you are looking for. Also try the Industrial or Ubuntu's Human derivate themes for metacity. We've made the unfocused windows very bland and in contrast to the colorful focused window.

Yenya wrote: Metacity

I know about devilspie - it is interesting, altough I have never got time to try it. However, binding to workspace does not work in Metacity even when explicitly set for a particular window. When I instruct Galeon to open a new tab (e.g. by clicking a ling in Liferea), it moves the whole window to the current workspace. In sawfish, it works as expected, and Galeon remains on its own workspace. Plus the two years old unfixed multihead bug noone bothered to fix. So metacity is unusable on my primary worksation.

Jakub Steiner wrote: corner case

It's good you've found a solution. I find the behavior you describe as flawed though. From the three options (move to the workspace that galeon is at after cliking a link (my dad: "where di my apps go?"), silently opening a tab in galeon without giving any feedback (my dad: "why doesn't the bloody link work?") and bringing galeon to the active workspace, the last appears to be the best choice for majority of users.

Yenya wrote: No general solution

Your dad would not pin the browser to a single workspace, of course. For unpinned windows the "move to the current workspace" behaviour is of course correct. But when user tells window manager that "this window should remain on this workspace", window manager should obey that. I am OK with either "open the new tab and switch to the Galeon workspace" or "open new tab silently at the different workspace" approaches, but "move the window that user explicitly requested to remain on some particular workspace to the different worksapce" is flawed and is directly against user's requests. It does not matter whether the user's request was wise or not, software should not try to be smarter than the user (and this is not even "smarter" like "enhance user needs", this is "do the opposite to what user has requested").

Yenya wrote: Where did my apps go?

Hmm, thinking about that -- the "where did my apps go" problem is there even with the current approach - I run Galeon in fullscreen mode, so metacity moves it on top of all other apps. If we want metacity to be "smart" (and I am not sure about that), it should not at least do this when the application that is to be moved to the different workspace is in the fullscreen mode.

Jakub Steiner wrote: pinning windows

I wasn't really aware of the "pinning" functionality. Does devil's pie provide that? The behavior you describe indeed sounds like a bug. However the pinning functionality appears like something my dad wouldn't want to worry about. It is like modding your car's chip for the extra hp. Most people just don't want to bother. I really prefer a WM that only draws the bloody window decorations and allows me to switch windows :) So I'm really happy with the approach of moving the "mod-kit" to a separate app. As for fullscreen, metacity is quite nasty for that. Gives me headaches in both blender and gimp. Unfortunately I'm not quite aware of all the aspects of the issue to file a proper bug report. I'm sure it has to do with working around gnome-panel's workarounds ;) My dad never had any window-management issues btw. Unfortunately I get a lot of Evolution questions ;)

Yenya wrote: mod-kits

I was wrong with window-pinning functionality of metacity - it was part of some additional app, (maybe devilspie). Metacity has only screen-pinning (i.e. "this window should always be on the visible workspace). As for "mod-kits" versus the "support by default" - well, why bother with more workspaces or other bells and whistles at all then? Or with other functionality like window resizing? I am all for "the app/wm should be simple by default", but not for the lack of functionality some GNOME apps seem to favour (both metacity and epiphany are excellent examples of this braindead approach). For example metacity lacks vertical maximization of windows, which can be handy for xterms - you need them to be 80 chars wide for compatibility reasons, but the height could be changed. I run mutt, slrn, and some other apps in 80x-sized terminals. Another example is firefox and epiphany - in Galeon, you can put the tabs on the left or right side, which makes the space available for the page itself narrower but higher - most pages are fixed-width anyway. Firefox however cuts off another line of the precious vertical space for the tab list, and it cannot be changed. You can then see the fixed-width web page through a ultra-wide but vertically small window, and most of the space is just filled by the page background. Fortunately, it seems that the epiphany folks are open to enhancing this browser via plugins, so we may one day see epiphany + plugins provide the needed functionality. But I don't see how plugins are different than the (disabled-by-default) support for something in the core app.

Jakub Steiner wrote: vertical/horizontal maximize

It doesn't lack the functionality actually. There's a couple of gconf keys you want to browse through. /apps/metacity/window_keybindings/maximize_vertically /apps/metacity/window_keybindings/maximize_horizontally

wrote:

Wow, thanks! When I started to use metacity few years ago, this definitely was not implemented.

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Wed, 16 Nov 2005

IP conntrack testing

We have a filtering router running Linux, which has around 1400 iptables rules, and multiple gigabit interfaces. For a long time I wanted to explore newer features of Netfilter, such as IP connection tracking (and the raw table with NOTRACK target), ulogd, etc.

On Saturday I have booted the new kernel with ip_conntrack, and the whole set of other Netfilter bells and whistles. I have not played with it so far, but the connection tracking is on, and it seems it had no significant performance impact on the server itself:

Packets per second CPU usage Connections tracked

The above graphs show values of packets per second routed, CPU usage (system time and user+system time), and number of connections. The new kernel with conntrack support is on since Saturday evening.

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Tue, 15 Nov 2005

Power grid update

On Saturday there was a scheduled power grid outage in the Faculty building in order to replace a power-generator and UPSes. When such things are to be done, the electricians assure us that there will be no outage at all (or only a small one, like in this case), but the reality is usually different.

I came to work around 6am to reboot all servers and switch the most important ones to the temporary power supply. The outage itself was planned to start at 7am. We have gradually rebooted our servers and plugged them to two extension cords which the electricians have prepared and declared that they would be sufficient for an expected load.

When reconnecting the last server, about half of the servers crashed - the circuit was overloaded and we blew out the breaker. So we had to add another extension cord on a separate temporary circuit, and moved some servers to it. However, we have found that even the other cord of the original two cords was overloaded as well - the cable itself was warm, and the rest of it which was still on the reel was so hot that it was not possible to keep a hand on it. It is a pure luck it did not catch the fire.

Fortunately when we moved another three servers to the third power cord, it started to cool down, and it worked during the whole outage. However, it seems the electricians missed the estimation of the load their extension cords can handle by about 50%.

In the evening the main power grid was back, so we started to plug the servers back to the original cords. However, the electricians messed up something while switching on a breaker on a non-UPS circuit, and they blew up one of the power supplies on our SunFire V880. The new power supply costs about US$ 1000 (in the U.S., here in the Czech Republic it is probably even more).

Aside from that, around 9pm all the servers were back on the main power supply. The reconstruction will continue on next two Saturdays, this time hopefully without the outages.

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Mon, 14 Nov 2005

Applications of the day

I've came across few interesting apps recently, hope you find them useful as well:

Hmm, when I get mad enough to explore the dark corners of e-learning, xvidcap and key-status can be useful...

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Pavol Babincak wrote:

Output of colored grep is quite nice. Thank you. (o:

adelton wrote: F-Spot

OKay, I tried F-Spot this weekend -- it seems the program maintains its own storage for all the images, so unlike gthumb it forces its own way of dealing with the images. Also, its red-eye reduction feature is next to useless. What is your F-Spot experiance? Did I miss something obvious?

Yenya wrote: http://www.fi.muni.cz/~kas/blog/

Actually, I have not tried f-spot - I wanted to do so, but I have given up when I found that f-spot is mono-based.

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Thu, 10 Nov 2005

Playing with Epson printer

We have an Epson Stylus Photo 2100 printer (7 inks, A3 width, roll-paper feed, paper cut-off, etc.), and I occasionally try to print a photo on it. The problem is that I usually forget which settings I've used before. This time I have decided to move this printer to my office in order to explore further its capabilities and create an informal how-to document for it.

Firstly my prints had shifted colors, as if the driver had wrong idea about which ink is in which slot (the printer has black, gray, cyan, light cyan, magenta, light magenta, and yellow inks). I have figured out that this happens in gimp-print when using 720x720 dpi resolution. When I changed my settings to 1440x1440 dpi, the problem disappeared.

Another problem was that when printing on a roll paper the printer leaves first 2cm of paper blank, which wastes this part of paper. And I was not able to make the paper cut-off working yet.

The next problem is the printer's user interface: I usually have problem to put the paper in - it probably depends on the printer driver settings, but it sometimes requires the paper to be fed to the printer through the hole for the roll paper, and the next time it demands the other input hole (for the stack of paper sheets) to be used. I have to test it further.

Anyway, here are few links for Epson 2100 software:

I will do more tests tomorrow and hopefully I will get even the paper cut-off and other features working.

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Wed, 09 Nov 2005

I occasionally spend few minutes here and there learning Japanese. I have managed to learn Hiragana and few basic rules of grammar so far. Here are links to the web pages/software which can be used to study Japanese:

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oozy wrote: Japanese links

As I already told you, it is very interesting reading, thanks. Maybe you would like the following links: http://del.icio.us/popular/japanese http://del.icio.us/tag/japanese http://del.icio.us/tag/japanese+language http://www.manythings.org/japanese/links/

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Mon, 07 Nov 2005

TMOU 7

On Friday night we took part in TMOU 7. It was an excellent competition, in my opinion even better than in the previous years. Interesting and innovative puzzles, nice landscapes, and we have even visited a former military rocket-launcher base. The city part of the game was not difficult for us, and we have finished this part on the second place.

The second part contained some difficult puzzles, though. I have speculated before, that we may fail to solve something easy enough, when we start to apply mathematics on it instead of using some simple method. This happened on stage 10. We have tried many difficult methods like XORing the nearby squares, shifting rows and columns, folding the paper, etc. However, we were finally able to abandon the previous wrong ideas, and use something new, which shockingly enough led to the correct solution: this puzzle is just a slightly obfuscated Morse code. We have arrived to the stage 10 at about 1:20am, and solved it four hours later.

The next stage took almost another four hours, but this time it was not a completely wasted time, because the solution itself was lengthy. We have lost between 6 to 8 hours at stages 10 and 11, and even though we have made a good progress in the rest of the game, we did not manage to finish the game in the time limit (which was Saturday noon).

We have left the game on Saturday at 12:15, when we have obtained the task of the stage 14 (out of 15). I guess this means we have finished somewhere between 6th and 10th place. Two teams have finished the whole game, one at 8:05am, and the second one around 11:15am. If you can read Czech, look at our report from the game.

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Abraixs wrote: Military base

Hi, where is the base located? I couldn't find any info on the official Tmou web pages about the location. Thx.

Yenya wrote: Re: Miltary base

It is named "Hvizdalka" and located near the road between Omice and Ostrovacice: http://mapy.seznam.cz/search.py?&sz=3&lo=59184028&la=177065360&zm=138&my=+156

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Fri, 04 Nov 2005

Booting Fedora with vanilla kernel

While testing the XFS information leak I have written about yesterday, I had to compile my own kernel on the testing machine. I already knew what to do on most Fedora systems - there are some problems with vanilla kernels on Fedora:

However, my test machine happened to be a plain default Fedora install, and Fedora installs itself on LVM(?). So the boot without initrd is not possible - the ramdisk is needed at least to set up LVM before the root filesystem can be mounted. This causes that another bunch of things have to be done before the vanilla kernel can be booted on Fedora on LVM:

I am not writing this to blame Fedora as unusable - I think their system is a step in right direction - to use new technologies "by default" instead of "on some special installation". I mean not only LVM here, but also udev, SELinux, etc. They should just document better what to do if somebody has to use a vanilla kernel on Fedora. I hope this text can help to fill up this gap.

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Thu, 03 Nov 2005

XFS information leak

Today one of our servers crashed, and one user lost the file he has been editing. The file did not contain neither a new data nor an old data, just some random garbage (part of it even appeared to formerly belong to some shell script). This is quite dangerous from the security point of view, because it means that after the crash (like a power failure or a hard reset) the files which have been written to near the time of the crash may contain random data from previously-unused blocks.

I have even hacked up a small program that just creates or rewrites a set of files with some "known" contents. When you hard-reset the computer running this program on the XFS volume, after the reset some of the files contain "random" garbage.

The same problem would probably appear even on ext3 with data=writeback mode. But I don't know about anybody who runs ext3 in this mode. The data=ordered mode, which is the default, does not have this problem.

I should probably write an article about my long-term experience with various filesystems some day. It seems all articles which compare the filesystems just do some performance measurements on one particular hardware, which tells nothing about a SMP scalability, or a performance over the device which allows parallel operations (such as RAID or LVM). Or, like this case, about the behaviour in corner cases such as system crashes or bad blocks. I think it does not matter whether the filesystem is 5 or 10% slower - if your HW runs at 95% of the disk or CPU utilization, you are screwed anyway and you need to buy a better hardware - the next month you will be at 100% and you would need to buy it anyway. What does matter OTOH is, how reliable the filesystem is and how stable are the filesystem tools (resierfsck is obviously the bad one here).

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Wed, 02 Nov 2005

Azumanga Daioh - a trip to Okinawa

A! I have found this link on Pete Zaitcev's blog. It contains real-life photos similar to the scenes from the Okinawa trip episode of the Azumanga Daioh. I want to visit Okinawa too!

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Tue, 01 Nov 2005

On Saturday evening we wanted to watch some movie. There was second part of Harry Potter on TV, starting at 8pm. We have decided that we would like to see it. However, it is difficult for us to watch anything at that time, because Iva usually goes to bed at least half an hour later. Recording the show on the VCR was not an option, because it is not possible to start watching the recorded show from the beginning when the recording is still in progress.

I have decided to download the movie over the Net, and we watched it on a computer instead on a TV. However, this brings a lot of questions, which nicely show how absurd the current copyright system is:

While in our country it is perfectly legal for us to download a copyrighted material for a personal use, it is not probably legal to offer this material for downloading. So the person we have downloaded the movie from was apparently doing something illegal. However, how it is different from him recording the show for us and sending us a VCR tape or a DVD? Or even how it is different from him recording the show to our own tape on our own VCR? And what about the TV aerial system we share with our neighbours? It also stores the TV signal for a while (even though it is few microseconds) and then rebroadcasts it using a VHF amplifier and a coaxial cable - is it illegal to store and redistribute the copyrighted material in this form?

And what harm (if any) has been done to the owners of this copyrighted material? We have seen this particular movie in a cinema, so we have already paid for it. And we would not have watched it on TV anyway, given the above time constraints.

A side note: try to think about it not in terms "this or that is legal or illegal", but use instead terms like "this or that is moral or not" (and why it is so), and "this harm has/has not been done". The law is only an imperfect codified form of what the society considers moral and what it considers immoral. And I think the present copyright system is very far away from my understanding of what is moral (promoting new artists and new work, not recording/distribution companies), especially when it is applied to an "information" available and distributable in the electronic form at virtually no cost.

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Jakub Steiner wrote: digital "rights"

>We have seen this particular movie in a cinema, so we have already paid for it. Nada. You pay for the movie ticket, you pay for the dvd. You pay for the special edition. You pay for seeing it on TV (the "TV tax"). You pay for it even if you haven't seen it at all (dvd-r "media tax"). The more advanced the technology is, the more locked in the distributors want to make it. You are being ripped off of the rights you had in the analog world. http://www.free-culture.cc/

Ji Cvachovec wrote:

I also find quite a big difference between what I consider (im)moral and what is (il)legal. In addition, the punishments for differently immoral behaviour can be the same. Example: if you drive in a dangerous way (and possibly threaten someone's life) and cause no accident, you can be penalized say 500-1000 Kc. That is approximately the same amount of money you are fined when you steal a chocolate bar. Stealing a chocolate bar is immoral of course, but dangerous driving is far more in my opinion.

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