Messages in this thread | | | Date | Fri, 16 Dec 2011 13:59:07 +0100 | From | Jens Axboe <> | Subject | Re: [patch 2/2]block: recursive merge requests |
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On 2011-12-16 02:52, Shaohua Li wrote: > In my workload, thread 1 accesses a, a+2, ..., thread 2 accesses a+1, > a+3,.... When the requests are flushed to queue, a and a+1 are merged > to (a, a+1), a+2 and a+3 too to (a+2, a+3), but (a, a+1) and (a+2, a+3) > aren't merged. > With recursive merge below, the workload throughput gets improved 20% > and context switch drops 60%.
Interesting, I didn't consider that corner case. Hard to argue with the numbers, this might positively impact apps using posix aio for instance. Applied to for-3.3/core.
-- Jens Axboe
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