linux-scalability
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RE: App/Sys Proc Experiment an insignificant success...

To: PianoMan <clemej@xxxxxxxxxxxx>
Subject: RE: App/Sys Proc Experiment an insignificant success...
From: Dimitris Michailidis <dimitris@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 23 Aug 2000 17:30:37 -0700 (PDT)
Cc: kanoj@xxxxxxxxxxxxxxxxxxx, linux-scalability@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.20.0008232013030.9221-100000@pianoman.cluster.toy>
Organization: SGI
Sender: owner-LinuxScalability@xxxxxxxxxxx
On 24-Aug-2000 PianoMan wrote:
> On a dual processor PIIIEB 666Mhz, I created a simple FPU intensive
> program that operated on 60MB of matricies.  It takes ~26 minutes to run
> completely.  When scheduled on the special designated application
> processor, it takes approximately 1 to 2% less wall clock time then when
> scheduled on the one system processor.  Thus, the performance benefit is
> probably too little to be worth it (or even to measure given measurement
> inaccuracy).  Had it been 5%, I would feel differently ;-)

Did you try loads that included a lot of network activity?  That's probably
where you'd see the biggest difference.  A lot of the network processing
happens in softirqs and your patch would take all this processing away from
the application cpu.

-- 
Dimitris Michailidis                    dimitris@xxxxxxxxxxxx

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