Oktyabr's note pad
A good place to collect my thoughts, bookmarks, stuff I don't want to forget that others might find useful too.
Sunday, February 19, 2006
How to Think Like A Computer Scientist
Wednesday, February 15, 2006
Software to Watch DVDs and All Multimedia Files on Ubuntu
Alphabetical Directory of Linux Commands
Tuesday, February 14, 2006
Very cool alt-arch blog.
Saturday, February 11, 2006
Open Source Web Design Templates
Friday, February 10, 2006
Great SSH and SCP Tips for Beginners to Experts
Thursday, February 09, 2006
Blender 3D: Noob to Pro
Kanotix rt-preempt kernel
I've got a rt-preempt kernel of my own running now! Still needs some tweaking but all my sound devices work, as does internet, graphics, etc. and I'm able to get 2.9ms latency in qjackctl without xruns (44100Hz, period = 64 frames, buffer = 2 periods).
Here is roughly how I did it in case anyone else wants to try and/or compare notes (if I've got something wrong or forgotten something please post and correct me! I'm still a n00b at kernel building.):
1) Download the latest vanilla kernel source from: http://www.kernel.org/pub/linux/kernel/v2.6/ In my case this was linux-2.6.15.tar.bz2
2)Switch to root, move the kernel source to /usr/src and unpack it there with tar jxf linux-2.6.15.tar.bz2
3)Remove old symbolic link "linux" and replace it with a new one going to your new directory and then cd to it:
ln -s linux-2.6.15 linux
4)Fire up your favorite text editor and edit the file "Makefile". The line that says "EXTRAVERSION=" simply add what you like to the end of it like your name, whatever. NO capital letters and NO underscores! Save the file.
5) Download the latest *matching* rt-preempt patch from http://people.redhat.com/mingo/realtime-preempt/ (matching means patch 2.6.15-rt16 in my case) to your new directory:
wget http://people.redhat.com/mingo/realtime-preempt/patch-2.6.15-rt16 (version will change over time)
6) Switch to the new kernel source directory and patch it:
patch -p1 < patch-2.6.15-rt16
*Not really sure what to do here, what to answer 'yes' to etc. so I answered "n" or chose the default option on the patch questions EXCEPT where it wants to know what level of PREEMPT you want... then you entire "4" for 'complete preemption'.
7) Now I copied the config file from my current kernel (do ls /boot to see what to enter here) to use as a config for the new one:
cp /boot/config-22.214.171.124-kanotix-3 .config
8) Run make menuconfig for console version or make xconfig (may require deps) for the graphical version of the configuration utility. Trim up the kernel by removing any drivers you are *sure* you don't need. If in doubt, leave it. Don't enable anything that you don't need. This may take some experimentation to get working right. I'm sure there is a more 'foolproof' way of doing this but I don't know what it is... yet. "Save" your new config when done.
9)Build the kernel, headers and modules:
make-kpkg kernel_image kernel_headers modules_image
This will take quite awhile depending on the power of your machine... On my AMD64+3500 it took just about 30 minutes. NOTE: "make-kpkg modules_clean" is something I've read in other tutorials but it gave me an error and suggested I could fix it by running kpkg once in that directory... I skipped it and went to the next line. Maybe on the next build of this kernel it will work...
If you complete all of the above with no errors you should be able to cd back to /usr/src (cd ../) and you should find some new .deb packages there for the kernel, any modules you built, and the kernel headers. Install them as you would any .debs (I use dpkg -i name_of_package.deb) and reboot. In my Kanotix this kernel was automatically chosen as the default and identified itself simply as "Debian 2.6.15"
NOTES: My graphics was shot when I first booted into this new kernel, probably because I either missed an option in menuconfig or because I had a messed up xorg.conf from an earlier kernel. EIther way it was easily fixed by switching to root and running the scripts found in /usr/local/bin:
./install-nvidia-debian.sh (I have an nvidia card! This won't work if YOU don't have an nvidia card!)
FINALLY I installed realtime-lsm with the following commands (might require deps on your machine):
apt-get install module-assistant
m-a get realtime-lsm
m-a get realtime-lsm-source
m-a build realtime-lsm-source
m-a install realtime-lsm
/sbin/modprobe realtime gid=29
Sunday, February 05, 2006
Ubuntu Studio: Music for Human Beings
Ubuntu Studio is an exciting new project headed by Dana Olson that acts as a central repository of work and ideas that endeavours to the goal of making ubuntu a suitable distribution for realtime audio creation.
Currently present as a wiki it already contains much useful information and is growing fast with the help of many interested ubuntu users.
Keep your eyes on this one!
Kanotix remaster links
Kanotix is a "live" cd based on Knoppix and debian "sid". It claims (apparantly rightfully too) to have the best hardware detection on the planet, is relatively "bleeding edge" (right where I like it!) and has a very nice and easy to use harddrive installation script.
I'm considering trying a remaster of Kanotix targeted at pro-audio use and have found the following couple of links useful in researching this matter:
A good thread at the Kanotix forums on the topic.
bootcd: remastering the debian way?