[Bugs] [Bug 1349953] thread CPU saturation limiting throughput on write workloads

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1349953



--- Comment #3 from Manoj Pillai <mpillai at redhat.com> ---
(In reply to Manoj Pillai from comment #1)
> Simpler reproduction with a single client:
> 
> Created the 12x(4+2) volume and fuse mounted on the client.
> 
> Run iozone single client write test with 8 threads/files:
> iozone -i 0 -w -+n -c -C -e -s 10g -r 64k -t 8 -F /mnt/glustervol/f{1..8}.ioz
> 
> Output:
> throughput for  8 initial writers  =  179084.75 kB/sec
> 

Same test with additional option: performance.client-io-threads on:
 throughput for  8 initial writers  =  773070.43 kB/sec

That's more like it!

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