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Subjectkernel performance & profiles under heavy disk I/O
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Ever since the early 2.3.4x kernels performance under moderate to heavy disk
I/O has dropped, possibly due to the elevator. 2.3.40 is substantially
faster than recent versions, by as much as 40%. I have generated some kernel
profiles under disk I/O load that are available from
ftp://oss.sgi.com/pub/profiles/. For these particular runs 2.3.40 was 25%
faster than 2.3.99-pre2. Notice the increase in the number of IRQs from the
disk controller (~250%) and the increase in scheduling activity (~400%), a
good deal of which is due to __get_request_wait.

--
Dimitris Michailidis dimitris@engr.sgi.com

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