Public bug reported:
I am using Kubuntu 9.04 with encrypted file systems.
When I am doing heavy I/O operations, like copying a 1 GB file, the system
becomes practically unusable.
With top, I have noticed [kcryptd] taking up a lot of resources. The nice
priority of the process is -5. Renicing it to 0 may help a bit, but not much. I
have also noticed that while I renice kryptd to 0, some time later, it is back
to -5. What gives?
This is probably a scheduling problem in the kernel.
My system is fairly modern: 2.5GHz Intel Core 2 Duo with 4GB RAM. Hardware
power should not be the issue here.
I think it is very sad that performance with encrypted volumes is so bad,
because it discourages people from securing their data on laptops, netbooks,
etc. I have also experienced this on several different systems with very
different hardware.
I have reported this bug on previous versions of Ubuntu back to, I
think, 7.04. I am a bit disappointed, that it has not been addressed.
I hope that you will try and fix this issue.
Please tell me, if there is anything I can do to help fix it. I am not a kernel
hacker, so I can not come up with a patch for this.
** Affects: ubuntu
Importance: Undecided
Status: New
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Bad performance and slow response time with heavy I/O on encrypted volumes
https://bugs.launchpad.net/bugs/386716
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