debian@xxxxxxx wrote: > I got very low read performance when I'm using /dev/md* devices (software > RAID0). The write performance is twice the read performance. > > My configuration is two USB 2.0 hard drives on separate USB 2.0 controller > ports. > > Case 1: > > Using /dev/md* directly on the /dev/sda and /dev/sdb devices gives 20MB/sec > with both read and write operations. However, when using: > > Case 2: > > # losetup -e aes256 /dev/loop1 /dev/md1 > # mount /dev/loop1 /mnt/hd > > gives 18 MB/sec performance on write operations, but 10 MB/sec performance > on read operations. What kernel version are you using? 2.4 or 2.6? If you are using 2.6 kernel, are you using anticipatory I/O scheduler? Have you tried different values for lo_prealloc= and lo_nice= settings? These are explained in section 9 of loop-AES' README file. -- Jari Ruusu 1024R/3A220F51 5B 4B F9 BB D3 3F 52 E9 DB 1D EB E3 24 0E A9 DD - Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
