lkml.org 
[lkml]   [2015]   [Jun]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v5 2/5] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop
From
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

Thanks,
Ming
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2015-06-22 08:41    [W:0.051 / U:0.848 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site