Currently, the trend with CPUs is to add more cores rather than increase
the speed of a single core.
This does not scale very well with certain things in the Linux kernel.
One of them is kcryptd.
A system able to deliver data with a speed of ~200 MB/s from a RAID
array, will be only able to deliver a fraction of it (i.e. ~40 MB/s in
my case) when reads are being done from a dm-crypt device.
This is because kcryptd is not SMP-aware: it performs all calculations
on a single logical CPU only.
Are there any plans to change it?
--
Tomasz Chmielewski
http://wpkg.org
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