[Bugs] [Bug 1418014] RFE: disable client.io-threads on replica volume creation

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1418014

Atin Mukherjee <amukherj at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |Triaged
             Blocks|                            |1418011
         Depends On|1418011                     |
           Assignee|bugs at gluster.org            |amukherj at redhat.com



--- Comment #1 from Atin Mukherjee <amukherj at redhat.com> ---
Description of problem:

client.io-threads is turned on by default in 3.9 release. While this tunable
has improved EC performance significantly, it has adverse effects on the
replicate volume performance, following BZs were filed by perf QE while
validating this option:


> https://bugzilla.redhat.com/show_bug.cgi?id=1413512 : [Perf]  Inconsistent sequential writes on FUSE due to client-io-threads

> https://bugzilla.redhat.com/show_bug.cgi?id=1404113 : [Perf] 12% Drop in  sequential reads on SMB v1.0

> https://bugzilla.redhat.com/show_bug.cgi?id=1397854 : [Perf] 10% and 20% drop in sequential writes  on SMB v1 and V3 with RHEL 6.8

> https://bugzilla.redhat.com/show_bug.cgi?id=1395204 : 34% drop in Random Writes  from 3.1.3 to 3.2 on FUSE


As these issues can not be addressed immediately as they are related to the
design limitation of AFR, we should turn this option off when a replicate
volume is created as a preventive measure.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1418011
[Bug 1418011] RFE: disable client.io-threads on replica volume creation
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