On 08/11/2011 05:58 PM, mark delfman wrote:
I seem to have hit a significant hard stop in MD RAID1/10 performance which seems to be linked to a single CPU thread. I am using extremely high speed (IOPS) internal block devices – 8 in total. They are capable of achieving> 1million iops. However if I use RAID1 / 10 then MD seems to use a single thread which will reach 100% CPU utilisation (single core) at around 200K IOPS. Limiting the entire performance to around 200K.
Out of interest, could you please run "perf top" to let us see where the kernel is busy?
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