[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 bugzilla at redhat.com
Mon Feb 29 12:59:54 UTC 2016


--- Comment #23 from Poornima G <pgurusid at redhat.com> ---
Oleksandr Natalenko, oh good to here that, thank you.

Tavis Paquette, looked at the profile info, doesn't seem to be the case we
fixed. In the case we fixed, the INODELK fop was consuming 99% of the time on
the brick side. That doesn't seem to be the case in the profile info you sent.
I see a lot of GETXATTR calls, but these shouldn't be reducing the perf
drastically as you have mentioned.

Also, was this with write-behind off or on?

So we could try 2 things:
1. If you generate the profile info as mentioned earlier with 3.7.6 client, for
the same workload, we will be able to compare the fops and latency.

2. http://review.gluster.org/13540 reduces the number of getxattrs which will
be called. This will increase the perf, may not be by multiple folds. If you
have a test system could try this, this patch will anyways will be part of
3.7.9 release.

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