Messages in this thread | | | Date | Thu, 23 Jan 2003 18:10:42 -0800 | From | Andrew Morton <> | Subject | Re: big ext3 sequential write improvement in 2.5.51-mm1 gone in 2.5.53-mm1? |
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rwhron@earthlink.net wrote: > > Did you add a secret sauce to 2.5.59-mm2?
I have not been paying any attention to the I/O scheduler changes for a couple of months, so I can't say exactly what caused this. Possibly Nick's batch expiry logic which causes the scheduler to alternate between reading and writing with fairly coarse granularity.
> 10x sequential write improvement on ext3 for multiple tiobench threads.
OK...
I _have_ been paying attention to the IO scheduler for the past few days. -mm5 will have the first draft of the anticipatory IO scheduler. This of course is yielding tremendous improvements in bandwidth when there are competing reads and writes.
I expect it will take another week or two to get the I/O scheduler changes really settled down. Your assistance in thoroughly benching that would be appreciated.
> 2.4.20aa1 8.24 7.21% 28.587 449134.11 0.10395 0.07086 114 > 2.5.59 9.50 5.50% 36.703 4310.62 0.00000 0.00000 173 > 2.5.59-mm2 35.28 17.69% 10.173 18950.56 0.01010 0.00000 199
boggle.
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