write performance of HW RAID VS MD RAID

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Hi NeilBrown,

As you may already see, I run a lot of tests with 10 HDDs for the patchset
"simplify block layer based on immutable biovecs"

Here is the summary.
http://minggr.net/pub/20150608/fio_results/summary.log

MD RAID6 read performance is OK.
But write performance is much lower than HW RAID6.

Is it a known issue?

Thanks.
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