On 18.03.2013 11:01, Heinz Diehl wrote: > On 18.03.2013, Matthias Schniedermeyer wrote: > > > The SSD i have can reach (with encryption) about 400MB/s, but that is > > best-case performance when all moons are aligned. I haven't really > > benchmarked the real-world performance, the dd-example (with conv=fsync) > > only got 88MB/s. > > On all my SSD disks, cryptsetup performance is not even near that. I > have about 450 MB/s without encryption, and max. 120 MB/s with. SSD performance has more 'it depends' than anything else. It isn't funny. ;-) But as i don't need my SSDs for write-heavy linear performance (much), the much better random-write rate than HDDs still make them worthwile. And the much better (random) read performance is the icing. Overwriting appers to have better performance, but that is nothing i would do regularly. dd if=/dev/zero of=zero bs=1M count=10k oflag=direct 10737418240 bytes (11 GB) copied, 116.629 s, 92.1 MB/s dd if=/dev/zero of=zero bs=1M count=10k oflag=direct conv=notrunc 10737418240 bytes (11 GB) copied, 50.3905 s, 213 MB/s dd if=/dev/zero of=zero bs=1M count=10k oflag=direct conv=notrunc 10737418240 bytes (11 GB) copied, 51.0608 s, 210 MB/s My previous SSD with a Sandforce controller had much worse "worst case" performance as the Sandforce controller really doesn't like incompressible data and encrypted data looks like (or at least should look like) incompressible random-data. -- Matthias _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
