Re: [problem] RH 2.4.7-2 kernel slows to a crawl under heavy i/o

From: Daniel Phillips (phillips@bonn-fries.net)
Date: Wed Aug 22 2001 - 22:31:05 EST

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In reply to: Jeff Busch: "[problem] RH 2.4.7-2 kernel slows to a crawl under heavy i/o"
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On August 22, 2001 11:57 pm, Jeff Busch wrote:
> 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.

I'd suggest:

watch cat /proc/meminfo
watch cat /proc/slabinfo

And also, please try 2.4.9 as well as -ac

--
Daniel
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