Messages in this thread | | | Subject | kernel performance & profiles under heavy disk I/O | From | Dimitris Michailidis <> | Date | 20 Mar 2000 19:01:48 -0800 |
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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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