On Wed, 10 Jun 2015 15:27:07 -0700 Ming Lin <mlin@xxxxxxxxxx> wrote: > 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? Did you tune the stripe_cache_size for the array? Try 32768. https://peterkieser.com/2009/11/29/raid-mdraid-stripe_cache_size-vs-write-transfer/ -- With respect, Roman
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