Ubuntu
linux-source-2.6.20 package

  1. Bug #82528
  2. Comment #15

Comment 15 for bug 82528

Revision history for this message
Andrew (adhenry) wrote : Re: Write load on DM-Crypt LUKS partition with reiserfs jams system

I have exactly the same problem on a newly installed Debian Etch system that was fully encrypted (except /boot) using the guided partitioner. I have an external WD MyBook 320GB 1394a disk that was unencrypted. Performance was fine to the 1394a disk (both read/write speeds as well as LAN transfer rates) until I encrypted it then I get exactly the same issues:

LAN performance both read and write is almost exactly halved. 11MB to 6MB ethernet and 2.5MB to 1.5MB read wireless.
Writes to 1394a the disk overload the CPU so that mouse pointer hangs every few seconds.
Writes to 1394a disk don't write at a steady rate, but suspend (no CPU) then after a while continue. kjournal and kcryptd/0 are the 2 processes taking all the CPU, but when the write suspends, they drop to zero.
Read rate is constant but rate is halved.

Does not seem Ubuntu related or related to that particular kernel as Etch does not use same kernel as Feisty or Gutsy.