On 30/10/14 21:04, Ketor D wrote:
Hi Mark,
Could you do a fio test in your env with the busy_poll=1 ?
I am very interested in the busy_poll result. Thanks!
Sure:
blocksize k | head iops | head iops (busy_pool=1)
------------+---------------+--------------------------
4 | 11114 | 12608
128 | 4551 | 6422
1024 | 1195 | 1175
4096 | 320 | 316
So looks like the busy_pool=1 improves performance for small and mid
range blocksizes but is a little slower at the larger end.
However there are a lot of variables here - I'm using iodepth=32 for
instance, and altering that may change the pattern I'm seeing, also a
system with more osd's may bring out different behaviours as it runs the
fio client out of available cpu power in the smaller block sizes.
Regards
Mark
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