[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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