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Date:	Sun, 29 Apr 2007 15:27:49 +0800
From:	"Quan Sun" <>
To:	"Robert Iakobashvili" <>
Subject: Re: Slow tcp handshakes rate of 2.6.20 and 2.6.19

On 4/28/07, Robert Iakobashvili <> wrote:
> What are the
> #cat /proc/sys/net/ipv4/tcp_mem values for your kernels?
> Do you see tcp memory pressure by
> #netstat -s ?

In my original kernel (,  tcp_mem is
 24576, 32768, 49152
There is several memory_pressure in the `netstat -s`.

After patching
author  John Heffner <>
        Fri, 16 Mar 2007 22:04:03 +0000 (15:04 -0700)
commit  53cdcc04c1e85d4e423b2822b66149b6f2e52c2c
[TCP]: Fix tcp_mem[] initialization.

In, tcp_mem is
97440, 129920, 194880
And during my benchmark, 'memory_pressure' is always 0.

After these two days test, this patch works fine for me and benchmark
gets a good result(as good as 2.6.18).

Thank you very much for your help.
Quan Sun
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