Public bug reported:
My system is unusably slow after the last kernel upgrade in Karmic.
With the latest kernel in karmic, the system takes about 15 minutes to
boot. At first I thought it was a hardware problem, but in the previous
kernel version the problem doesn’t exist.
It ist not an interrupt latency or interrupt frequency problem, because
powertop shows no unusual interrupt load and top shows CPU usage not in
system or iowait, but in user time.
"openssl speed bf" shows about 400kB/s blowfish encryption, while this
should be in excess of 20000kB/s. top uses about 25% CPU with its
default update interval, so it isn’t just some process that hogs the
CPU, it rather feels like the CPU being much too slow, so that things
just take longer (in CPU time) to complete.
It is the kind of behaviour I would expect if the memory bus were
running at 2% of its normal frequency, or similar.
The bug occurs in
linux-image-2.6.31-11-generic 2.6.31-11.36
It does not occur in
linux-image-2.6.31-10-generic 2.6.31-10.35
Nothing in the changelog between those versions indicates any relevant
change.
uname and lspci output is from the unaffected kernel version, kern.log
is from the affected version.
If you need any specific information, feel free to ask, I will reboot
and test in the broken kernel, but it’s painful, and I will not wait for
X to start.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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System unusably slow
https://bugs.launchpad.net/bugs/439922
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