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Re: NAPI, e100, and system performance problem

To: Andi Kleen <ak@xxxxxx>
Subject: Re: NAPI, e100, and system performance problem
From: Arthur Kepner <akepner@xxxxxxx>
Date: Fri, 22 Apr 2005 11:37:17 -0700 (PDT)
Cc: jamal <hadi@xxxxxxxxxx>, Greg Banks <gnb@xxxxxxx>, "Brandeburg, Jesse" <jesse.brandeburg@xxxxxxxxx>, netdev@xxxxxxxxxxx, davem@xxxxxxxxxx
In-reply-to: <20050422183004.GC10598@xxxxxx>
References: <C925F8B43D79CC49ACD0601FB68FF50C03A633C7@orsmsx408> <Pine.LNX.4.61.0504180943290.15052@xxxxxxxxxx> <1113855967.7436.39.camel@xxxxxxxxxxxxxxxxxxxxx> <20050419055535.GA12211@xxxxxxx> <m1hdhzyrdz.fsf@xxxxxx> <1114173195.7679.30.camel@xxxxxxxxxxxxxxxxxxxxx> <20050422172108.GA10598@xxxxxx> <1114193902.7978.39.camel@xxxxxxxxxxxxxxxxxxxxx> <20050422183004.GC10598@xxxxxx>
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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


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