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Re: bad TSO performance in 2.6.9-rc2-BK

To: John Heffner <jheffner@xxxxxxx>
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: Nivedita Singhvi <niv@xxxxxxxxxx>
Date: Wed, 29 Sep 2004 14:10:24 -0700
Cc: Andi Kleen <ak@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, herbert@xxxxxxxxxxxxxxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
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John Heffner wrote:

On Wed, 29 Sep 2004, Andi Kleen wrote:

I tried to re-test it but I didn't get very far because the kernel
with your patch crashes regularly during netperf. No serial console,
but the backtrace is {tcp_ack+877} {tcp_rcv_established+350} ...
Before that there are a few "retrans out leaked" messages.

I just tried to re-create this situation, and I got the same problem.
Latest bk tree with dave's 5 patches, gcc 3.3.4, uni-processor p4/e1000 to
a slow-ish p3/sk98lin (dual-cpu but with maxcpus=1).

I just crashed too, no backtrace. netperf tcp stream test,
and was on bk14 + dave's 5 patches, p4/e1000 -> Intel Pentium
M proc (1.7GHz). Going to repeat on slower SMPs with serial
console, get more info..


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