system laggy under load, SCHED_BSD

[Kris Kennaway]

On Sun, Jan 22, 2006 at 11:00:28PM +0100, Tobias Roth wrote:
> Hi
> 
> Since some time, I experience extremely bad system behaviour under
> load. For instance when compiling something, or unpacking a large
> archive, the system is almost unusable, even the mouse pointer
> reacts sloppy.
> 
> My system:
> 
> 6.0-STABLE FreeBSD 6.0-STABLE #7: Sun Jan 22 15:53:39 CET 2006 i386
> 
> I use SCHED_BSD.
> 
> How can I diagnose the problem, or provide more information? What
> factors might influence what I experience? I cannot give a more precise
> point in time as when this started, since I switched versions and
> systems a few times recently.

This has been discussed a number of times: the short answer is to look
for interrupt storms (vmstat -i), interrupt sharing (also vmstat -i),
and in particular shared interrupts involving usb or other drivers
still under Giant.

Kris
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