linux-kernel - Re: [PATCH] Adding multiple workers to the loop device.

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Date:   Tue, 21 Jan 2020 20:01:08 +0000
From:   "muraliraja.muniraju" <muraliraja.muniraju@...rik.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     axboe@...nel.dk,
        "muraliraja.muniraju" <muraliraja.muniraju@...rik.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Adding multiple workers to the loop device.

Below is the dd results that I ran with the worker and without the worker changes. 
Enhanced Loop has the changes and ran with 1,2,3,4 workers with 4 dds running on the same loop device.
Normal Loop is 1 worker(the existing code) with 4 dd's running on the same loop device.
Enhanced loop
1 - READ: io=21981MB, aggrb=187558KB/s, minb=187558KB/s, maxb=187558KB/s, mint=120008msec, maxt=120008msec
2 - READ: io=41109MB, aggrb=350785KB/s, minb=350785KB/s, maxb=350785KB/s, mint=120004msec, maxt=120004msec
3 - READ: io=45927MB, aggrb=391802KB/s, minb=391802KB/s, maxb=391802KB/s, mint=120033msec, maxt=120033msec
4 - READ: io=45771MB, aggrb=390543KB/s, minb=390543KB/s, maxb=390543KB/s, mint=120011msec, maxt=120011msec
Normal loop
1 - READ: io=18432MB, aggrb=157201KB/s, minb=157201KB/s, maxb=157201KB/s, mint=120065msec, maxt=120065msec
2 - READ: io=18762MB, aggrb=160035KB/s, minb=160035KB/s, maxb=160035KB/s, mint=120050msec, maxt=120050msec
3 - READ: io=18174MB, aggrb=155058KB/s, minb=155058KB/s, maxb=155058KB/s, mint=120020msec, maxt=120020msec
4 - READ: io=20559MB, aggrb=175407KB/s, minb=175407KB/s, maxb=175407KB/s, mint=120020msec, maxt=120020msec

The Enhanced loop is the current patch with number of workers to be 4. Beyond 4 workers I did not see a significant changes.