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[cablop <246413@xxxxxxxxxxxxxxxxxx>]

a simplier workarround not using LVM or Raid0 is just to create multiple
encrypted partitions, each one will run a single kcryptd, but you can
isolate the i/o demanding volumes, like the swap or a partition to hold
virtual machine disk images

the downside is you need to enter your password multiple times at boot...
somebody said that if you create them at install with the alternate disk you can just use one password, but i lost the reference

at the linux irc somebody suggested the recommended number of partitions
is your number of cpu cores + 1

i'm running two partitions on a netbook now to isolate my virtual
machine and it seems to work nice, sometimes the computer become slow,
but it is not freezing, my VM is not saturating the kcryptd bottleneck
anymore, it has its own bottleneck to deal with :P

simplier and more flexible than the raid0 hack, well...

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https://bugs.launchpad.net/bugs/246413

Title:
  kcryptd process doesn't utilize multiple cpus