[Bugs] [Bug 1358606] limited throughput with disperse volume over small number of bricks

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1358606

Zhang Huan <zhhuan at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |zhhuan at gmail.com



--- Comment #27 from Zhang Huan <zhhuan at gmail.com> ---
FYI. We also hit this issue in our test. Instead of testing glusterfs, we are
testing glusterfs with samba. We have a distribute gluster volume with 4
servers and with 1 brick each. We use samba to export the volume to windows and
test is done on windows. Of course, glusterfs plugin is used by samba.
io-thread xlator is disabled in our test.

Here is the performance difference. These number is from 72 streamings using a
single windows, and samba has aio option enabled. Thus there is only one
glusterfs client running in the cluster.
                   read           write
w/o patch          1.07GB/s       1.20GB/s
w/ patch           1.68GB/s       1.33GB/s

I wrote a patch to fix this, before I found that it has already been working.
My patch is using a similar method as Raghavendra does but has a little
different implementation. I just put it here FYI.
https://github.com/zhanghuan/glusterfs-1/commit/f21595d8ac5623cad6c8e6c7079684f6c29365c9

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