On Fri, 2018-01-12 at 19:52 -0500, Mike Snitzer wrote:
> It was 50 ms before it was 100 ms. No real explaination for these
> values other than they seem to make Bart's IB SRP testbed happy?
But that constant was not introduced by me in the dm code. See e.g. the
following commits:
commit d548b34b062b60b4f4df295a0b4823dfda1f1fc4
Author: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Thu Mar 5 22:21:10 2015 -0500
dm: reduce the queue delay used in dm_request_fn from 100ms to 10ms
Commit 7eaceaccab ("block: remove per-queue plugging") didn't justify
DM's use of a 100ms delay; such an extended delay is a liability when
there is reason to re-kick the queue.
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 7eaceaccab5f40bbfda044629a6298616aeaed50
Author: Jens Axboe <jaxboe@xxxxxxxxxxxx>
Date: Thu Mar 10 08:52:07 2011 +0100
block: remove per-queue plugging
Code has been converted over to the new explicit on-stack plugging,
and delay users have been converted to use the new API for that.
So lets kill off the old plugging along with aops->sync_page().
Signed-off-by: Jens Axboe <jaxboe@xxxxxxxxxxxx>
Bart.
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