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Re: bad TSO performance in 2.6.9-rc2-BK

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: Andi Kleen <ak@xxxxxxx>
Date: Thu, 23 Sep 2004 00:47:32 +0200
Cc: Andi Kleen <ak@xxxxxxx>, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040922152535.7bc81c8a.davem@xxxxxxxxxxxxx>
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On Wed, Sep 22, 2004 at 03:25:35PM -0700, David S. Miller wrote:
> 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?

22-23MB/s, but not 21MB/s. Ok "breaks completely" was a bit of overstatement,
admitted.

-Andi

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