[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



--- Comment #9 from Manoj Pillai <mpillai at redhat.com> ---

Comparing glusterfs-3.8.2-1 with a private build that incorporates the logic in
comment #2.

Config: (like before)
1x(4+2) disperse volume on 6 servers,  1 RAID-6 brick per server
with client-io-threads enabled; event-threads set to 4; lookup-optimize on

Test: single client iozone write test:
iozone -i 0 -w -+n -c -e -s 10g -r 64k -t 8 -F /mnt/glustervol/f{1..8}.ioz

glusterfs-3.8.2-1:
throughput for  8 initial writers  =  281965.19 kB/sec

private build:
throughput for  8 initial writers  =  760830.82 kB/sec

That's exactly the kind of improvement we were expecting, based on comment #0
and comment #1.

So that's great news -- the RCA is comment #2 appears correct. As I understand
from Raghavendra, the patch is failing regressions, so it might need to be
reworked and we cannot declare victory yet. But good to know that we are on the
right track.

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