Messages in this thread | | | Date | Wed, 30 Dec 2009 19:45:35 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] cfq-iosched: non-rot devices do not need queue merging |
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On Wed, Dec 30 2009, Corrado Zoccolo wrote: > Non rotational devices' performances are not affected by > distance of requests, so there is no point in having overhead > to merge queues of nearby requests.
If the distance is zero, it may still make a big difference (at least for writes). This check would be better as "ncq and doesn't suck", ala
blk_queue_nonrot(q) && tagged
like we do elsewhere.
-- Jens Axboe
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