[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


--- 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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