On 05/14/2011 04:36 PM, Kyle Rose wrote: > For the past week I've been trying to figure out why my > dm-crypt-on-RAID6 performance is so terrible. To wit: > > root@yupa:/source# hdparm -t /dev/md1 > > /dev/md1: <---the RAID 6 block device > Timing buffered disk reads: 1262 MB in 3.00 seconds = 420.19 MB/sec > > root@yupa:/source# hdparm -t /dev/mapper/yupa > > /dev/mapper/yupa: <---the dm-crypt device with /dev/md1 as the underlying store > Timing buffered disk reads: 370 MB in 3.00 seconds = 123.26 MB/sec IIRC hdparm is doing direct io of size 2MB. Can you try do the same but with dd (just dd from device without direct mode). like "dd if=/dev/md1 of=/dev/null bs=64k count=4096" Gives it better throughput now? (on 2.6.38 and above) Milan _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
