[Bugs] [Bug 1530519] disperse eager-lock degrades performance for file create workloads

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1530519

Ashish Pandey <aspandey at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |POST
           Assignee|aspandey at redhat.com         |jahernan at redhat.com



--- Comment #2 from Ashish Pandey <aspandey at redhat.com> ---
Description of problem:
The current behavior of the option disperse.eager-lock is not optimal:

disperse.eager-lock on: good performance on large-file read/write, but actually
degrades performance for many file create workloads. The degradation for file
create workloads seems to be due to lock contention on directories.

disperse.eager-lock off: loses the performance advantages of eager-locking for
large-file access, but better performance on file create workloads than with
disperse.eager-lock on.

We should fix eager locking so that it can be kept on without incurring a
performance penalty on file create workloads.

Version-Release number of selected component (if applicable):
glusterfs*-3.12.1-2.el7.x86_64

How reproducible:
Consistently

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