Messages in this thread | | | Date | Tue, 24 Mar 2009 09:15:45 +0000 | From | Alan Cox <> | Subject | Re: Linux 2.6.29 |
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> posted to the list earlier trying to see if there was anything that > could be done to help my specific case. I've got a system where if > someone starts writing out a large file, it kills client NFS writes. > Makes the system unusable: > http://marc.info/?l=linux-kernel&m=123732127919368&w=2
I have not had this problem since I applied Arjan's (for some reason repeatedly rejected) patch to change the ioprio of the various writeback daemons. Under some loads changing to the noop I/O scheduler also seems to help (as do most of the non default ones)
> Everyone seems to agree that "autotuning" it is the way to go. But no > one seems willing to step up and try to do it. Probably because it's > hard to get right!
If this is a VM problem why does fixing the I/O priority of the various daemons seem to cure at least some of it ?
Alan
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