Using the patches posted yesterday
(http://marc.info/?l=linux-kernel&m=117740312628325&w=2) here are some
quick read results (as measured by iostat over a 5 minute period, taken
in 6 second intervals) on a 4-way IA64 box with 42 disks (24 FC and 18
U320), 42 processes (1 per disk) with 256 AIOs (16KB) outstanding at all
times per device:
2.6.21-rc7: 1,006.023 MB/second
2.6.21-rc7 + new CFQ IO scheduler: 1,030.767 MB/second
showing about a 2.46% performance improvement with a 2.43% increase in
%system used (3.738% -> 3.829%).
Interestingly enough this patch also seems to remove some noise during
the run - see the chart at http://free.linux.hp.com/~adb/cfq/rkb_s.png
Alan D. Brunelle
HP / Open Source and Linux Organization / Scalability and Performance Group
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