[Bugs] [Bug 1377193] Poor smallfile read performance on Arbiter volume compared to Replica 3 volume
bugzilla at redhat.com
bugzilla at redhat.com
Fri Sep 23 05:43:42 UTC 2016
https://bugzilla.redhat.com/show_bug.cgi?id=1377193
--- Comment #4 from Ravishankar N <ravishankar at redhat.com> ---
Pranith suggested that the extra lookups and inodelks could be due to spurious
heals triggered for some reason. Indeed, disabling client side heals brings the
read performance numbers in proximity replica-3. On debugging it was found that
the lookups were triggering metadata heals due to a mismatching count in the
dict, as explained in the patch (BZ 1378684).
Here are the profile numbers with the fix on arbiter vol:
No. of calls:
Brick1 Brick2 Arbiter brick
Lookup 28805 28809 28817
Read 34920 17507 -
FSTAT 34991 17547 -
Inodelk 8 8 8
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