Following is the bugzilla that was opened against this problem. http://bugzilla.kernel.org/show_bug.cgi?id=10378 Since I wasn't able to reproduce it on a server machine again, it was later closed. If you think it is the same issue, please feel free to re-open it. Ritesh On Mon, Jun 2, 2008 at 6:01 PM, Yan Li <elliot.li.tech@xxxxxxxxx> wrote: > Hi Milan, > > On Mon, Jun 02, 2008 at 08:52:00AM +0200, Milan Broz wrote: > > Please could you try if patch here helps and doesn't cause performance > degradation? > > > http://www2.kernel.org/pub/linux/kernel/people/agk/patches/2.6/2.6.25/dm-crypt-add-cond_resched.patch > > Will the result of testing a Debian 2.6.24-etchnhalf.1-amd64 kernel > (very near a vanilla kernel) be of same value? Since the data on some > other drives on this server is important so I dare not try 2.6.25-rc > on it. > > Following is my test plan, comments are welcomed: > > Test command: > # dd if=/dev/zero of=/dev/mapper/open_device bs=500M count=10 > (this server has 2G memory) > > The command will be run for 3 times, and average speed of last two > runs will be taken as result score. > > Dm-crypt LUKS Encryption scenarios: > aes-cbc-essiv:sha256, keysize 128 > aes-xts-plain, keysize 256 > aes-xts-plain, keysize 512 > > I will compare the speed of all above 3 encryption scenarios, with and > without the patch. > > -- > Li, Yan > -- Ritesh Raj Sarraf RESEARCHUT - http://www.researchut.com "Necessity is the mother of invention."
