I can reproduce this issue with 9.10-rc (kernel version
2.6.31-14-server). I have also seen it in previous versions and on
different hardware.
The slower speeds when dm-crypt is in use are obvious when testing with
bonnie++ as seen below. The /data partition is an ext4-formatted 32G LVM
logical volume on a multi-terabyte software RAID 10. The same volume is
used in both tests - right after the first test I unmounted it, did a
luksFormat, luksOpen, formatted it (with the same options) and mounted
it.
The server is a quad-core Xeon and there is no reason it should be
bottlenecked on this.
Without dm-crypt:
o...@fsv:~$ bonnie++ -f -n 0 -d /data
Version 1.03c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
fsv 8G 193134 25 57920 11 171750 15 605.2
1
With dm-crypt:
o...@fsv:~$ bonnie++ -f -n 0 -d /data
Version 1.03c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
fsv 8G 132252 8 31394 5 63636 6 426.7 1
--
kcryptd process doesn't utilize multiple cpus
https://bugs.launchpad.net/bugs/246413
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