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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