Messages in this thread | | | Date | Thu, 2 Dec 2004 11:48:36 -0800 | From | Andrew Morton <> | Subject | Re: Time sliced CFQ io scheduler |
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Jens Axboe <axboe@suse.de> wrote: > > as: > Reader: 27985KiB/sec (max_lat=34msec) > Writer: 64KiB/sec (max_lat=1042msec) > > cfq: > Reader: 12703KiB/sec (max_lat=108msec) > Writer: 9743KiB/sec (max_lat=89msec) > > If you look at vmstat while running these tests, cfq and deadline give > equal bandwidth for the reader and writer all the time, while as > basically doesn't give anything to the writer (a single block per second > only). Nick, is the write batching broken or something?
Looks like it. We used to do 2/3rds-read, 1/3rd-write in that testcase. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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