[dm-crypt] Poor write performance on software raid with 512k chunk size

Alasdair G Kergon agk at redhat.com
Sun Feb 26 14:37:29 CET 2012


As we've mentioned to others, try increasing 
   /sys/block/<devices>/queue/nr_requests
significantly (e.g. see if 50,000 has any impact).

Or experiment with these patches:
  http://people.redhat.com/mpatocka/patches/kernel/dm-crypt-paralelizace/current/
(at your own risk, of course).

Alasdair



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