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Re: bad TSO performance in 2.6.9-rc2-BK

To: Andi Kleen <ak@xxxxxxx>
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: Nivedita Singhvi <niv@xxxxxxxxxx>
Date: Wed, 22 Sep 2004 13:07:08 -0700
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040922195515.GA2619@xxxxxxxxxxxxx>
References: <20040920063012.GL2825@krispykreme> <20040920203021.GD4242@xxxxxxxxxxxxx> <20040921155835.18aee381.davem@xxxxxxxxxxxxx> <20040922140000.GD27432@xxxxxxxxxxxxx> <20040922111209.7887df53.davem@xxxxxxxxxxxxx> <20040922195515.GA2619@xxxxxxxxxxxxx>
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Andi Kleen wrote:

With tso off i get the same performance as on 2.6.5.

I must add that this is a CSA e1000 (directly integrated into
the chipset and doesn't use PCI) and TSO doesn't seem to be bring any advantage. On 2.6.5 the performance is the same
with both TSO on or off.

Andi, was that with a netperf TCP stream test? I
would not have thought there would be no difference
prior to the changes DaveM made recently (now we
obey congestion window). We certainly got quite a bit
of a difference running SPECWeb etc, but that was on
the e1000s.

Nivedita




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