On 09/14/2011 04:04 PM, Peter Merhaut wrote: > i've got a really strange problem with my setup, and i'm not quite sure why. It is known problem, current implementation depends on how are IO submitted and writes and reads differs this way (I think page cache interferes here). Reads are slower, because parallel operations are timed differently causing these waits. If you use some more realistic IO pattern than dd, you can get different output though. (dd is NOT good performance test. But everyone uses that:-) We have some ideas how to improve parallel processing inside dm-crypt but other things had higher priority still. (You can see this problem even measured against zero virtual devices, so read/write caching is not the real problem here.) Milan _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
