[Bugs] [Bug 1478411] Directory listings on fuse mount are very slow due to small number of getdents () entries

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1478411



--- Comment #25 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/18947 committed in release-3.12 by
\"Raghavendra G\" <rgowdapp at redhat.com> with a commit message- cluster/dht:
don't overfill the buffer in readdir(p)

Superflous dentries that cannot be fit in the buffer size provided by
kernel are thrown away by fuse-bridge. This means,

* the next readdir(p) seen by readdir-ahead would have an offset of a
dentry returned in a previous readdir(p) response. When readdir-ahead
detects non-monotonic offset it turns itself off which can result in
poor readdir performance.

* readdirp can be cpu-intensive on brick and there is no point to read
 all those dentries just to be thrown away by fuse-bridge.

So, the best strategy would be to fill the buffer optimally - neither
overfill nor underfill.

> Change-Id: Idb3d85dd4c08fdc4526b2df801d49e69e439ba84
> BUG: 1492625
> Signed-off-by: Raghavendra G <rgowdapp at redhat.com>
(cherry picked from commit e785faead91f74dce7c832848f2e8f3f43bd0be5)
Change-Id: Idb3d85dd4c08fdc4526b2df801d49e69e439ba84
BUG: 1478411
Signed-off-by: Raghavendra G <rgowdapp at redhat.com>

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