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Date: Mon, 22 Jun 2015 14:32:49 +0800 From: Ming Lei <ming.lei@...onical.com> To: Christoph Hellwig <hch@...radead.org> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Dave Kleikamp <dave.kleikamp@...cle.com>, Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>, Maxim Patlasov <mpatlasov@...allels.com>, Andrew Morton <akpm@...ux-foundation.org>, Alexander Viro <viro@...iv.linux.org.uk>, Tejun Heo <tj@...nel.org>, Dave Chinner <david@...morbit.com> Subject: Re: [PATCH v5 2/5] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop On Wed, Jun 10, 2015 at 3:36 PM, Christoph Hellwig <hch@...radead.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 Thanks, Ming -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
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