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SubjectRe: [problem] RH 2.4.7-2 kernel slows to a crawl under heavy i/o
I have been trying to duplicate a similar problem in my lab that happened
to me on a production box with 2.4.5. do you have a test that will allow
you to replicate the problem at will?

David Lang

On Wed, 22 Aug 2001, Jeff Busch
wrote:

> Date: Wed, 22 Aug 2001 16:57:35 -0500
> From: Jeff Busch <jbusch@half.com>
> To: linux-kernel@vger.kernel.org, roswell-list@redhat.com
> Subject: [problem] RH 2.4.7-2 kernel slows to a crawl under heavy i/o
>
> machine: Compaq Proliant DL360 w/4GB mem, dual 36GB SCSI drives
> OS: RedHat 7.1 + errata updates, kernel-enterprise-2.4.7-2.i686.rpm from
> 'Roswell 2'
>
> Under heavy I/O (Apache and a custom C++ module which do lots of mmap and
> munmap calls over large data sets - 7GB total), the machine slows to a
> crawl. The problem persists even after live traffic to the machine ceases.
> A top listing shows both cpu's at 100% system. Any commands (ps, uname,
> whatever) take minutes to return results.
>
> The same setup on RH 6.2 with 2.4.3-ac3 works fine. Please let me know what
> information may be useful to debugging this problem (no oops yet), and other
> kernels to try; I'm looking at 2.4.8-ac9 right now.
>
> Thanks,
> Jeff Busch
> System Administrator
> Half.com - an eBay company
>
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