Messages in this thread | | | Date | Thu, 23 Jun 2005 19:33:56 -0700 (PDT) | From | <> | Subject | Re: cfq misbehaving on 2.6.11-1.14_FC3 |
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--- Con Kolivas <kernel@kolivas.org> wrote: > I found the same, and the effect was blunted by noatime and > journal_data_writeback (on ext3). Try them one at a time and see what you > get.
I had to move to a different box, but get the same kind of results (for ext3 default mount options).
Here are the latencies (all cfq) I get with different values for the mount parameters
ext2 default 0.1s
ext3 default 52.6s avg
reiser defaults 29s avg 5 minutes then, 12.9s avg
ext3 rw,noatime,data=writeback 0.1s avg
reiser rw,noatime,data=writeback 4s avg for 20 seconds then 0.1 seconds avg
So, indeed adding noatime,data=writeback to the mount options improves things a lot. I also tried without the noatime, and that doesn't make much difference to me.
That looks like a good workaround, I'll now try with the actual server and see how things go.
Nicolas
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