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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: "David S. Miller" <davem@xxxxxxxxxxxxx>
Date: Wed, 22 Sep 2004 15:25:35 -0700
Cc: andy.grover@xxxxxxxxx, ak@xxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040922220628.GC2619@xxxxxxxxxxxxx>
References: <20040920063012.GL2825@krispykreme> <20040920203021.GD4242@xxxxxxxxxxxxx> <20040921155835.18aee381.davem@xxxxxxxxxxxxx> <20040922140000.GD27432@xxxxxxxxxxxxx> <20040922111209.7887df53.davem@xxxxxxxxxxxxx> <20040922195515.GA2619@xxxxxxxxxxxxx> <c0a09e5c04092213126ba5f29d@xxxxxxxxxxxxxx> <20040922133906.7d57ef49.davem@xxxxxxxxxxxxx> <20040922220628.GC2619@xxxxxxxxxxxxx>
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On Thu, 23 Sep 2004 00:06:28 +0200
Andi Kleen <ak@xxxxxxx> wrote:

> > One thing that could be biting us is the nagle check which
> > probably needs to be adjusted to use the standard MSS not
> > the TSO one... perhaps play with this patch:
> 
> I tried it and it breaks the performance completely
> (21MB/s) 

You said you were getting 22MB/sec before the change, right?

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