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SubjectRe: 2.5.59mm5 database 'benchmark' results
David Mansfield <david@cobite.com> wrote:
>
>
> Hi Nick, Andrew, lists,
>
> I've been testing some recent kernels to see how they compare with a
> particular database workload. The workload is actually part of our
> production process (last months run) but on a test server. I'll describe
> the platform and the workload, but first, the results :-)
>
> kernel minutes comment
> ------------- ----------- ---------------------------------
> 2.4.20-aa1 134 i consider this 'baseline'
> 2.5.59 124 woo-hoo
> 2.4.18-19.7.xsmp 128 not bad for frankenstein's montster
> 2.5.59-mm5 157 uh-oh
>
> Platform:
> HP LH3000 U3. Dual 866 Mhz Intel Pentium III, 2GB ram. megaraid
> controller with two channels, each channel raid 5 PV on 6 15k scsi disks,
> one megaraid LV per PV.
>
> Two plain disks w/pairs of partitions in raid 1 for OS (redhat 7.3), a
> second pair for Oracle redo-log (in a log 'group').
>
> Oracle version 8.1.7 (no aio support in this release) is accessing
> datafiles on the two megaraid devices via /dev/raw stacked on top of
> device-mapper

Rather impressed that you got all that to work ;)

It does appear that the IO scheduler change is not playing nicely with
software RAID.

> I'll test any kernel you throw my way.

Thanks. Could you please try 2.5.59-mm5, with

http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.59/2.5.59-mm5/broken-out/anticipatory_io_scheduling-2_5_59-mm3.patch

reverted?


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