On Fri, Feb 24, 2012 at 01:29:54AM +0000, Alasdair G Kergon spake thusly: > Have you done much tuning, in particular /sys/block/<devices>/queue/nr_requests ? > > http://www.redbooks.ibm.com/redpapers/pdfs/redp4285.pdf remains a good background > read. Given that a non-dmcrypt mysqldump on the same disks (different logical volume) finishes and 15 minutes and a dmcrypt mysql backup happens in 30 minutes any tuning being done would have to be dmcrypt-specific and affect something in the dmcrypt layer or above, correct? nr_requests only exists for the physical disk device. Just for kicks I just bumped it up to 8192 from the default 1024 and ran my test again. Same performance: Twice as slow as without dmcrypt. -- Tracy Reed _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
