Late followup, but that did indeed work. I also went back 9.10 with a
current patch level and saw the same thing, so this appears to be a
kernel version thing and not just the version of Ubuntu.
For others, this is what I did to permanently disable ipmi and get my CPU back:
1. Edit /boot/config-{kernversion}-server (on mine right now this is
2.6.31-22); comment out any line with IPMI in it.
2. Get rid of /lib/modules/2.6.31-22-server/kernel/drivers/char/ipmi/ipmi_* (or
whatever your kern version is). I moved these files to another location just
in case I needed them.
3. Profit!!
After a reboot, ksoftirqd is back to being happy.
--
ksoftirqd high CPU on 10.04-LTS Server
https://bugs.launchpad.net/bugs/575392
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