[Bugs] [Bug 1455872] [Perf]: 25% regression on sequential reads on EC over SMB3

bugzilla at redhat.com bugzilla at redhat.com
Fri Aug 3 00:59:20 UTC 2018


Worker Ant <bugzilla-bot at gluster.org> changed:

           What    |Removed                     |Added
             Status|POST                        |MODIFIED

--- Comment #4 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/20511 committed in master by "Raghavendra G"
<rgowdapp at redhat.com> with a commit message- performance/open-behind: don't use
anonymous fds for reads by default

anonymous fds interfere with working of read-ahead as read-ahead won't
be able to store its cache in fd. Also, as seen in bz 1455872,
anonymous fds also affect performance of large file sequential reads
as the cost of opening fd for each read on brick stack is
significant. So, have a proper fd which enables read-ahead to store
its cache and brick stack to reuse the fd during reads.

With this change test
fails consistently. The failure can also be seen with open-behind
off. bz 1611532 has been filed to track the issue with test. Thanks to
Rafi <rkavunga at redhat.com> for assistance provided in debugging test

Change-Id: Ifa52d8ff017f115e83247f3396b9d27f0295ce3f
Signed-off-by: Raghavendra G <rgowdapp at redhat.com>
Fixes: bz#1455872

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