[Bugs] [Bug 1309462] Upgrade from 3.7.6 to 3.7.8 causes massive drop in write performance. Fresh install of 3.7.8 also has low write performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1309462



--- Comment #37 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/13644 committed in release-3.7 by Vijay
Bellur (vbellur at redhat.com) 
------
commit e9fa7aeb1a32e22ff0749d67995e689028ca5a19
Author: Ravishankar N <ravishankar at redhat.com>
Date:   Tue Mar 8 16:43:12 2016 +0530

    afr: misc performance improvements

    Backport of http://review.gluster.org/#/c/13595/
    1. In afr_getxattr_cbk, consider the errno value before blindly
    launching an inode refresh and a subsequent retry on other children.

    2. We want to accuse small files only when we know for sure that there
    is no
    IO happening on that inode. Otherwise, the ia_sizes obtained in the
    post-inode-refresh replies may mismatch due to a race between
    inode-refresh and ongoing writes, causing spurious heal launches.

    Change-Id: I9858485d1061db67353ccf99c59530731649c847
    BUG: 1309462
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/13644
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    Reviewed-by: Krutika Dhananjay <kdhananj at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>

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