Aside from the fact, that SMP support would not do any harm, you should
consider this:
Volumes >> 1TB have certain weaknesses - this is pretty much true for
all block chaining enrcyption schemas.
Even though if you use a hardware raid 5(6) controller, you should have
a collection of several logical volumes on top of it, each encrypted
with a different key.
I am pretty sure, this scales rather well with several cores/CPUs.
Regards
-Sven
Tomasz Chmielewski schrieb:
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?
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