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(parent: ff36ab3) | patch
dm: only run the queue on completion if congested or no requests pending
authorMike Snitzer <snitzer@redhat.com>
Tue, 24 Feb 2015 16:03:22 +0000 (11:03 -0500)
committerMike Snitzer <snitzer@redhat.com>
Wed, 15 Apr 2015 16:10:12 +0000 (12:10 -0400)
commit9a0e609e3fd8a95c96629b9fbde6b8c5b9a1456a
treef16b43f956f54b0a1c214a8bba840b85217ed963tree | snapshot (tar.gz zip)
parentff36ab34583ae23250a4bf39805d69771e7e0131commit | diff
dm: only run the queue on completion if congested or no requests pending

On really fast storage it can be beneficial to delay running the
request_queue to allow the elevator more opportunity to merge requests.

Otherwise, it has been observed that requests are being sent to
q->request_fn much quicker than is ideal on IOPS-bound backends.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm.c diff | blob | blame | history