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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: Andrew Grover <andy.grover@xxxxxxxxx>
Date: Wed, 22 Sep 2004 13:12:47 -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>
Reply-to: Andrew Grover <andy.grover@xxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On Wed, 22 Sep 2004 21:55:15 +0200, Andi Kleen <ak@xxxxxxx> 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.

I think this is caused by the congestion changes added between
2.6.9-rc1 and rc2. I am seeing good performance with rc1 and tso on
(or off), but bad performance with rc2 and bk-latest only if tso is
on.

Regards -- Andy

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