[Bugs] [Bug 1495397] Make event-history feature configurable and have it disabled by default

bugzilla at redhat.com bugzilla at redhat.com
Thu Oct 5 12:02:46 UTC 2017


--- Comment #3 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/18387 committed in release-3.12 by jiffin
tony Thottan (jthottan at redhat.com) 
commit 761942e9fe8f6d7bbd5c56720e52dc4f6663cd9f
Author: Krutika Dhananjay <kdhananj at redhat.com>
Date:   Thu Sep 7 18:48:34 2017 +0530

    mount/fuse: Make event-history feature configurable

    ... and disable it by default.

            Backport of:
            > Change-Id: Ia533788d309c78688a315dc8cd04d30fad9e9485
            > Reviewed-on: https://review.gluster.org/18242
            > BUG: 1467614
            > cherry-picked from commit

    This is because having it disabled seems to improve performance.
    This could be due to the lock contention by the different epoll threads
    on the circular buff lock in the fop cbks just before writing their
    to /dev/fuse.

    Just to provide some data - wrt ovirt-gluster hyperconverged
    environment, I saw an increase in IOPs by 12K with event-history
    disabled for randrom read workload.

    mount -t glusterfs -o event-history=on $HOSTNAME:$VOLNAME $MOUNTPOINT
    glusterfs --event-history=on --volfile-server=$HOSTNAME

    Change-Id: Ia533788d309c78688a315dc8cd04d30fad9e9485
    BUG: 1495397
    Signed-off-by: Krutika Dhananjay <kdhananj at redhat.com>

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