Public bug reported:
Hardware:
2xIntel Xeon Quad Core @2.2ghz
Ubuntu 8.04.1 AMD64
8GB FB-DIMM ram
2xSAS 15000RPM in Hardware Raid as operating system
7xSamsung 1TB SATA in Software Raid (/dev/md0) entire volume put in lvm and
encrypted to (/dev/mycrypt)
/dev/md0 has a sustained read/write of 300-400MB/s whereas /dev/mycrypt
has a mere 70-90MB/s.
I believe the bottleneck lies in the lack of parallelism in the kcryptd
process. This process tops out at %100 cpu usage and will not utilize
more cpus.
Running multiple read/write processes (tested using dd) does not
increase throughput.
Is there a configuration somewhere to allow kcryptd to multithread, or
does the current code lack this functionality? If this functionality is
not already implemented then is there a reason such as security or
synchronization?
** Affects: cryptsetup (Ubuntu)
Importance: Undecided
Status: New
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kcryptd process does utilize multiple cpus
https://bugs.launchpad.net/bugs/246413
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