On Tue, 12 Apr 2005 23:18:35 +0100
Baruch Even <baruch@xxxxxxxxx> wrote:
> Hello,
>
> I'm trying to port my H-TCP and SACK improvements to 2.6.11, but I seem
> to hit performance problems that are unrelated to what I worked on so far.
>
> My tests show that between 2.6.6 and 2.6.7 the TCP performance dropped
> considerably.
Remember 2.6.6 had the old hyper aggressive and over correcting version
of BIC.
> The setup for the tests, vanilla kernels, dummynet with 100 Mbit/s and
> 40ms rtt using the BIC protocol. No patches applied whatsoever.
>
> iperf tests for 2.6.6 get about 90Mbit/s while 2.6.7 gets 30Mbit/s.
Haven't measured old kernels recently. But haven't seen that with the
newest stuff I tested last night. At 40ms delay with netem
over 1G to 100M bridge.
Reno 99.6
Vegas 61.6
BIC 97.8
Hstcp 99.4
Westwood 99.4
What are your sysctl settings.
> I was wondering if someone can think of a reason why this happens?
>
> Is there a way to get the different network related patches between
> these two versions? I don't have access to bk to get it myself.
>
> Baruch
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