Re: Why is kslowd accumulating so much CPU time?

From: tytso
Date: Mon Jun 14 2010 - 17:46:56 EST

On Mon, Jun 14, 2010 at 02:42:44PM -0400, Nick Bowler wrote:
> This sounds exactly like the issue I've been seeing on a T500 laptop, as
> well (GM45 board). The slowdowns render the system essentially
> unusable, as it can spend a loooong time just moving the mouse cursor a
> few pixels on the screen. During this time, nothing else on the display
> is updating (glxgears drops to 0fps). Things generally seem to be
> working fine if I am not moving the mouse, or if I'm not running X.

I saw exactly the same behaviour when using the Ubuntu Karmic
userspace. Basically, using a 2.6.35-rc2 (+ vt memory corrupter fix)
kernel, the system was essentially unusable. Interestingly, the
problem went away (with the same kernel) once I updated to Ubuntu
Lucid. I was going to mention that so that hopefully someone with far
more than I could figure out how much of this is a X server
bug, and how much of this was a kernel bug, but things worked just
*fine* with 2.6.34 kernel.

Occasionally it will happen that the mouse stops tracking, and then I
grumble and curse, and a few seconds later it resolves itself. I
haven't had time to track it down; but the problem was breathtakingly
easy to reproduce with an Ubuntu Karmic userspace. :-)

- Ted
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