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- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Mar 23 2000 - 21:00:31 EST