From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: gyro@zeta-soft.com (Scott L. Burson)
Cc: linux-kernel@vger.kernel.org
Subject: Re: Performance issue on dual Athlon MP
Date: Thu, 7 Mar 2002 23:44:27 +0000 (GMT) [thread overview]
Message-ID: <E16j7Yh-0004CL-00@the-village.bc.nu> (raw)
In-Reply-To: <15494.32860.773969.762627@kali.zeta-soft.com> from "Scott L. Burson" at Mar 07, 2002 03:20:48 PM
> 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.
next prev parent reply other threads:[~2002-03-07 23:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-06 19:28 Performance issue on dual Athlon MP Dieter Nützel
2002-03-06 20:49 ` John Jasen
2002-03-07 23:20 ` Scott L. Burson
2002-03-07 23:44 ` Alan Cox [this message]
2002-03-08 0:24 ` Randy.Dunlap
2002-03-11 9:32 ` Jens Axboe
2002-03-11 20:13 ` Randy.Dunlap
2002-03-14 15:49 ` Scott L. Burson
-- strict thread matches above, loose matches on Subject: below --
2002-03-06 22:09 rwhron
2002-03-06 18:47 Scott L. Burson
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