Re: fio rbd completions (Was: fio rbd hang for block sizes > 1M)

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On 28/10/14 11:32, Jens Axboe wrote:
On 10/27/2014 03:59 PM, Mark Kirkwood wrote:
On 28/10/14 05:20, Ketor D wrote:
V8 patch runs good.

The iops is 33032. If I just comment the usleep(100) in the master, I
can get iops 35245.
The CPU usage about the two test is same 120%.
So maybe this patch could be better!


Yeah, v8 is working for me.

I'm seeing it a bit slower for some blocksizes, but faster (or perhaps
about the same within repeat measurement error) for others:

blocksize k |  patched iops | orig iops
------------+---------------+-----------
4           | 12265         | 11930
128         |  5800         |  7100
1024        |  1193         |  1196

As for most things, the difference should be in IOPS, not bandwidth. So
I would assume that the above are within normal variance, since 4k
should show the biggest difference, then drop off after that and match
at 128/1024k.



Yeah, I suspect the 4K numbers are the same as we are bottlenecked by Ceph's small blocksize performance, not fio itself. If Ketor has a setup that can get higher IOPS @4K it would be interesting to see his numbers for patched vs orig!

Cheers

Mark
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