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Re: bad TSO performance in 2.6.9-rc2-BK

from [Nivedita Singhvi] [Permanent Link][Original]
To: Anton Blanchard <anton@xxxxxxxxx>
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: Nivedita Singhvi <niv@xxxxxxxxxx>
Date: Mon, 20 Sep 2004 08:54:18 -0700
Cc: netdev@xxxxxxxxxxx
In-reply-to: <20040920063012.GL2825@krispykreme>
References: <20040920063012.GL2825@krispykreme>
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.1) Gecko/20031030
Anton Blanchard wrote: 
Hi,

I just tried latest 2.6.9-rc2-BK on a machine with an e1000 on it. With
TSO off it does about 100MB/sec. With TSO on it does between 1MB/sec and
10MB/sec.


Hey Anton,  yep, I was just debugging this. TSO mainline reworked
implementation is still not cooked. Don't worry, final state won't
be this bad :).

Could you echo 0 > /proc/sys/net/ipv4/tcp_bic and redo test,
please?



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