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Subject: Re: Performance issue on dual Athlon MP
To: gyro@zeta-soft.com (Scott L. Burson)
Date: Thu, 7 Mar 2002 23:44:27 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <15494.32860.773969.762627@kali.zeta-soft.com> from "Scott L. Burson" at Mar 07, 2002 03:20:48 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> BTW, this doesn't seem like a preemption issue, considering that throughput
> is very definitely affected as well as latency.
> 
> Anyway, please let me know if there's anything I can do, within my
> constraints, to help.  (As you can guess, though, I don't have any kernel
> debugging experience.)

It sounds like the hit you are taking is from highmem and I/O (having to
copy pages lower into memory so the I/O subsystem can use them). Some of
that is in the hard to fix for 2.4 category with the x86. There are some
experimental patches around but they are experimental.
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