[dm-crypt] Bad performance with software RAID5 and LUKS encryption

Jens Wahnes wahnes at uni-koeln.de
Tue Jul 5 15:30:34 CEST 2011

Philipp Wendler wrote:

> [1] All speed measurements were done with several runs of
> dd if=/dev/zero of=DEV bs=100M count=100

Did you consider using another block size? I have noticed that this can
have considerable impact under the conditions I was testing once. Do
you see any changes if you try, e.g.

dd if=/dev/zero of=DEV bs=4K count=2500000

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