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Re: [PATCH] TSO Reloaded

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: Re: [PATCH] TSO Reloaded
From: John Heffner <jheffner@xxxxxxx>
Date: Tue, 17 May 2005 22:51:53 -0400
Cc: netdev@xxxxxxxxxxx
In-reply-to: <>
References: <> <> <>
Sender: netdev-bounce@xxxxxxxxxxx
On May 17, 2005, at 10:28 PM, David S. Miller wrote:

From: John Heffner <jheffner@xxxxxxx>
Date: Tue, 17 May 2005 22:26:09 -0400

Though it may be moot by now, I just ran some tests of my own with this
patch. This was on a dual 2.4 GHz Xeon booted with a UP kernel,
running iperf over an e1000 at a 1500 byte MTU. I measured idle CPU by
running a process which sits in a gettimeofday() loop. Numbers are CPU
utilization, all turned out +/- 1%.

No TSO:  86.6%
Old TSO: 61.0%
New TSO: 88.5%

Yeah, TSO Reloaded really stinks. :-)

Try the "Super TSO" patch I just posted instead.

Interesting timing. :) With the new patch I'm getting 78.0%.


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