I'm using AES 256bit XTS so a 512bit key, hdparm used to give me ~85mb/s so something has happened. These values are on a standard AES 256bit CBC raid0: Timing cached reads: 1240 MB in 2.00 seconds = 620.24 MB/sec Timing buffered disk reads: 144 MB in 3.00 seconds = 47.94 MB/sec Timing O_DIRECT cached reads: 54 MB in 2.03 seconds = 26.56 MB/sec Timing O_DIRECT disk reads: 96 MB in 3.05 seconds = 31.47 MB/sec Pretty much the same numbers as on the XTS partition. Cheers Andreas On Tue, 27 Jan 2009 15:12:07 +0100, Sven Eschenberg <sven@xxxxxxxxxxxxxxxxxxxxx> wrote: > 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 --------------------------------------------------------------------- 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
