[dm-devel] dm-crypt parallelization patches

Andi Kleen ak at linux.intel.com
Wed Sep 11 23:33:35 UTC 2013


> The patches mainly help with sequential I/O (sequential I/O is normally 
> submitted from a few CPUs, so existing dm-crypt doesn't parallelize 
> right). There is a decrease of performance when 12 threads are doing 
> writes on ramdisk:

That's a bit worrying. Could you please find a larger system (4S) in RH and
try with that?

I suspect you may need to limit the load balancing to smaller groups
of CPUs. Querying all other CPUs all the time is unlikely to scale.

-Andi




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