Messages in this thread | | | Date | Wed, 4 Aug 2010 13:53:03 +0200 (CEST) | From | Mikael Abrahamsson <> | Subject | Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs |
| |
On Wed, 4 Aug 2010, Christoph Hellwig wrote:
> The good news is that you have it tracked down, the bad news is that I > know very little about dm-crypt. Maybe the issue is the single threaded > decryption in dm-crypt? Can you check how much CPU time the dm crypt > kernel thread uses?
I'm not sure it's that. I have a Core i5 with AES-NI and that didn't significantly increase my overall performance, as it's not there the bottleneck is (at least in my system).
I earlier sent out an email wondering if someone could shed some light on how scheduling, block caching and read-ahead works together when one does disks->md->crypto->lvm->fs, becase that's a lot of layers and potentially a lot of unneeded buffering, readahead and scheduling magic?
-- Mikael Abrahamsson email: swmike@swm.pp.se
| |