Description of problem: 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 response 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. Usage: mount -t glusterfs -o event-history=on $HOSTNAME:$VOLNAME $MOUNTPOINT OR glusterfs --event-history=on --volfile-server=$HOSTNAME --volfile-id=$VOLNAME $MOUNTPOINT Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
REVIEW: https://review.gluster.org/18387 (mount/fuse: Make event-history feature configurable) posted (#1) for review on release-3.12 by Krutika Dhananjay (kdhananj)
REVIEW: https://review.gluster.org/18387 (mount/fuse: Make event-history feature configurable) posted (#2) for review on release-3.12 by Krutika Dhananjay (kdhananj)
COMMIT: https://review.gluster.org/18387 committed in release-3.12 by jiffin tony Thottan (jthottan) ------ commit 761942e9fe8f6d7bbd5c56720e52dc4f6663cd9f Author: Krutika Dhananjay <kdhananj> 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 956d43d6e89d40ee683547003b876f1f456f03b6 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 response 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. Usage: mount -t glusterfs -o event-history=on $HOSTNAME:$VOLNAME $MOUNTPOINT OR glusterfs --event-history=on --volfile-server=$HOSTNAME --volfile-id=$VOLNAME $MOUNTPOINT Change-Id: Ia533788d309c78688a315dc8cd04d30fad9e9485 BUG: 1495397 Signed-off-by: Krutika Dhananjay <kdhananj>
This bug is getting closed because a release has been made available that should address the reported issue. In case the problem is still not fixed with glusterfs-glusterfs-3.12.2, please open a new bug report. glusterfs-glusterfs-3.12.2 has been announced on the Gluster mailinglists [1], packages for several distributions should become available in the near future. Keep an eye on the Gluster Users mailinglist [2] and the update infrastructure for your distribution. [1] http://lists.gluster.org/pipermail/gluster-users/2017-October/032684.html [2] https://www.gluster.org/pipermail/gluster-users/