Messages in this thread | | | Date | Sat, 12 Jun 2004 16:31:52 +1000 | From | Nick Piggin <> | Subject | Re: PROBLEM: Heavy iowait on 2.6 kernels |
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Guy Van Sanden wrote: > I recently discovered why my new Gentoo server slows to a crawl on a > intermediate load on the 2.6 kernel series. The reason seems to be an > unusual amount of iowait. > I can reproduce this on two systems, one with a KT400 and and one with > Sis735 chipset. > > iostat -c 1 (or vmstat) while running something like bonnie produces > iowaits of 99%. > Any 2.6 kernel responds the same (regardless of the patchset), even > vanilla. (2.6.5-mm, 2.6.6-mm, 2.6.6-vanilla and 2.6.5-gentoo-r1). > Any 2.4-series kernel is fine. >
Hi, can you try booting with elevator=deadline, please? Then include a vmstat 1 output for a 2.6 and a 2.4 kernel.
I don't think 2.4 kernels will show iowait, so some real performance measurements would be helpful.
Thanks
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