What kind of encryption? One thing I noticed about dmcrypt: obviously it cannot exploit both cores as good as other encryption software. And it would be interesting what kind of encryption you use. A 8400 Wolfdale (3GHz, dualcore) can reach a maximum of slightly over 200 MB on 256bit AES. If one core is exploited this would go down to something around 100 MB/sec, and 512bit give an additional slowdown. Not even considering IO Waiting etc. Regards -Sven On Tue, 2009-01-27 at 14:47 +0100, Andreas Westin wrote: > > On Tue, Jan 27, 2009 at 02:26:13PM +0100, Heinz Diehl wrote: > > > >> No. My rates are totally stable with 2.6.28.2 and at the same level as > >> they were running any 2.6.28.x so far. > > > > 2.6.28.x vanilla, forgot to mention it, sorry! > > > > Ok, I'm running vanilla + grsecurity. Forgot to mention that it's LUKS. > > some numbers on a LUKS raid0: > > hdparm -tT > Timing cached reads: 1246 MB in 2.00 seconds = 622.90 MB/sec > Timing buffered disk reads: 122 MB in 3.01 seconds = 40.51 MB/sec > > hdparm -tT --direct > Timing O_DIRECT cached reads: 70 MB in 2.04 seconds = 34.26 MB/sec > Timing O_DIRECT disk reads: 104 MB in 3.04 seconds = 34.26 MB/sec > > hdparm -tT (on unencrypted device) > Timing cached reads: 1486 MB in 2.00 seconds = 743.18 MB/sec > Timing buffered disk reads: 530 MB in 3.00 seconds = 176.59 MB/sec > > hdparm -tT --direct (on unencrypted device) > Timing O_DIRECT cached reads: 232 MB in 2.01 seconds = 115.40 MB/sec > Timing O_DIRECT disk reads: 476 MB in 3.01 seconds = 158.36 MB/sec > > Pretty bad slowdown with encryption, hw is amd x2 4200+, 1gb ram. > > /Andreas > > --------------------------------------------------------------------- > dm-crypt mailing list - http://www.saout.de/misc/dm-crypt/ > To unsubscribe, e-mail: dm-crypt-unsubscribe@xxxxxxxx > For additional commands, e-mail: dm-crypt-help@xxxxxxxx > --------------------------------------------------------------------- dm-crypt mailing list - http://www.saout.de/misc/dm-crypt/ To unsubscribe, e-mail: dm-crypt-unsubscribe@xxxxxxxx For additional commands, e-mail: dm-crypt-help@xxxxxxxx
