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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: Fri, 24 Sep 2004 10:30:07 +0200
Cc: Andi Kleen <ak@xxxxxxx>, niv@xxxxxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040923161141.4ea9be4c.davem@xxxxxxxxxxxxx>
References: <20040921155835.18aee381.davem@xxxxxxxxxxxxx> <20040922140000.GD27432@xxxxxxxxxxxxx> <20040922111209.7887df53.davem@xxxxxxxxxxxxx> <20040922195515.GA2619@xxxxxxxxxxxxx> <c0a09e5c04092213126ba5f29d@xxxxxxxxxxxxxx> <20040922133906.7d57ef49.davem@xxxxxxxxxxxxx> <20040922220628.GC2619@xxxxxxxxxxxxx> <20040922152535.7bc81c8a.davem@xxxxxxxxxxxxx> <20040922224732.GD2619@xxxxxxxxxxxxx> <20040923161141.4ea9be4c.davem@xxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
> Anyways, for testing, something like the patch below.  If things
> still stink a bit, try using a limit of "2" in this patch instead
> of "4".

Doesn't help unfortunately. Anything >= 2 gives 22MB/s or even below
(e.g. 3 gives 16MB/s). The only factor that works is 1, but that 
turns TSO effectively off, doesn't it? 

-Andi

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