Messages in this thread | | | Date | Mon, 22 Jun 2015 14:32:49 +0800 | Subject | Re: [PATCH v5 2/5] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop | From | Ming Lei <> |
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On Wed, Jun 10, 2015 at 3:36 PM, Christoph Hellwig <hch@infradead.org> wrote: > On Tue, Jun 09, 2015 at 09:49:23PM +0800, Ming Lei wrote: >> It doesn't make sense to enable merge because the I/O >> submitted to backing file is handled page by page. > > Looks fine, but does it make any difference?
Looks no, see the following result, please:
- iops tested by fio: loop over image on HDD. patched vs. non-patched randread 158 161 read 8716 8784 randwrite 6076 5893 write 21896 22066
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