From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arthur Kepner <akepner@sgi.com>
Subject: Re: NAPI, e100, and system performance problem
Date: Fri, 22 Apr 2005 11:37:17 -0700 (PDT)
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Cc: jamal <hadi@cyberus.ca>, Greg Banks <gnb@sgi.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@intel.com>, netdev@oss.sgi.com,
        davem@redhat.com
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To: Andi Kleen <ak@muc.de>
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On Fri, 22 Apr 2005, Andi Kleen wrote:

> ....
> Also I doubt the workload Jesse and Greg/Arthur/SGI saw also had issues
> with CPU power (can you guys confirm?)
> 

The problem that we've had is that flushing PIOs can take a long 
time. So the CPU can spend more time spinning, waiting for the PIOs 
to flush, than doing useful work. 

I'm going to try to get some new (2.6.12-rc2) data this weekend.

--
Arthur