Baruch Even's Blog

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Entries from March 2005.

22nd March 2005

Now I can set my kernel to compile and load on the test machines (a script for that already exists :-), I set the receiver to run and when it exits the test is automatically run through ssh with public-key authentication.

All this means is that the usual cycle of 10 minutes waiting for a proper compile, boot and test, is now done with no human interaction, and I have time to get some more coffee (or write a blog entry).

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Linux Kernel Patches
31st March 2005

I have two patch sets for the kernel folks to review, one is the HTCP congestion control algorithm and the other is performance improvements to the kernel TCP transmit code.

The first is also tied in licensing issues and there seems to be a deadlock, the kernel folks are not interested in reviewing it before the licensing is taken care of (and I understand them!) and the officials are in no hurry to solve the licensing until they'll know it will go in. I've context switched to other tasks to see who will break first.

The second set is a set of performance improvement patches initially done by my supervisor Doug Leith, and I'm improving on that now. Part of my work is to port it from 2.6.6 to 2.6.11+ which is what I'm doing now, as well as refactoring the code and throwing away bits I don't think should be there.

I've switched from the original use of web100 to use relayfs and a script to add logging code, loosely based on ideas from Aspect-Oriented-Programming.

I've passed on my journey through using kprobes (cool stuff!), but the overhead blows my code so I'd prefer to avoid it. Kprobes had a bug when placed on a ret instruction which my testing helped uncover. Relayfs had gove some improvements based on my input, so my work is helping others.

And all of that in the name of having clean code so that it will be easier to submit to lkml when I'm done. No measurement code is embedded in my production code at any time.

Thanks to Tom Zanussi for his help with relayfs and the systemtap folks for their help with kprobes.

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