Messages in this thread | | | Date | Tue, 6 Aug 2002 07:42:58 +0200 | From | Jens Axboe <> | Subject | Re: Linux v2.4.19-rc5 |
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On Mon, Aug 05 2002, Bill Davidsen wrote: > On 1 Aug 2002, Steven Cole wrote: > > > Here are some dbench numbers, from the "for what it's worth" department. > > This was done with SMP kernels, on a dual p3 box, SCSI disk, ext2. > > The first column is dbench clients. The numbers are throughput > > in MB/sec. The 2.5.29 kernel had a few RR-supplied smp fixes. > > Looks like for this limited test, 2.4.19-rc5 holds up pretty well. > > I've also ran this set of tests several times on -rc5 using ext3 > > and data=writeback, and everything looks fine. > > > > Steven > > Call me an optimist, but after all the reliability problems we had win the > 2.5 series, I sort of hoped it would be better in performance, not > increasingly worse. Am I misreading this? Can we fall back to the faster > 2.4 code :-(
try a work load that excercises the block i/o layer alone (O_DIRECT, raw, whatnot) and then compare 2.4 and 2.5. ibm had some slides on this from ols, unfortunately I don't know if they have then online.
please don't put too much wait in dbench numbers for this sort of thing :-)
-- Jens Axboe
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