Baruch Even's Blog

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Entries from February 2005.

FlexiFW 2
4th February 2005

In other news, I've submitted (with my supervisor) a proposal for a presentation in OLS 2005. I hope to get that accepted, I'd be happy to go to OLS, and it just never works out. This time it can actually be work :-) and not a "waste of time and money", as my SO would put it.

Why is it called SO? "SO you want to go there without me?"
:-)

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Improving Linux TCP performance
18th February 2005

I've been working to improve the performance of the Linux Kernel TCP stack. Apparently it's not very efficient and there are several things that can be done. The measurements I'm doing and the improvements I've done so far will be the topic of my OLS 2005 paper (should it be accepted...).

The problems with the current implementation are not evident until you actually go to long links of 200Mbit/s, they are obviously painful when you get to 1Gb/s.

The other factor in not seeing the problems currently is the use of TCP, the plain TCP congestion control algorithm (NewReno), is not effective and does not utilize the link when talking about 1Gb/s links. That's where the HTCP algorithm which was developed in the Hamilton Institute comes.

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BIC sucks
18th February 2005

In addition there is a bug in the current implementation of the Linux BIC congestion control algorithm, which makes it so much more aggressive.

Full report and patches will be provided soon.

Update: Report can be found at http://hamilton.ie/net/bic-fix/Linux%20BicTCP.pdf.

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