> on the encrypted partition : Time: 134 seconds , cpu iowait about 40-50 %
> on the unencrypted partition : Time: 72 seconds , cpu iowait about 10 %
You see the huge difference with my results of testing 8.04 -generic kernel
(whose results are not good too).
It seems things become worse.
Just for fun I tested old host still running 2.4.25 uniprocessor kernel on
Seagete Barracuda SATA drive (no RAID cards):
not encrypted device: 15 seconds
encrypted (cryptoloop) device: 18 seconds
iostat shows about 750 reads/sec!
Its definitely something wrong with modern 2.6 kernels.
The kind of IO load that I try to reproduce with testing script is typical
database reading workload (random access, small blocks). Modern kernels perfoms
bad with this kind of IO (at least Ubuntu kernels).
I hope kernel maintainers/developers will find time to discover and resolve the
issue.
--
Random access read speed from encrypted device is very slow compared with other
linux distributions
https://bugs.launchpad.net/bugs/363763
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