On Sun, 07 Jul 2013 19:39:27 +0200 Milan Broz <gmazyland@xxxxxxxxx> wrote: > So if you have multiple IOs submitted in parallel from *different* CPUs, > they are processed in parallel. > > If you have MD over dmcrypt, this can cause problem that MD sumbits all IOs > with the same cpu context and dmcrypt cannot run it in parallel. For RAID1 and RAID10 this isn't true any more. Commit f54a9d0e59c4bea3db733921ca9147612a6f292c in 3.6 changed this for RAID1 and a similar commit did for RAID10. RAID4/5/6 still submit from a single thread as you say. NeilBrown
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