Tom Melvin wrote:

> I have a machine that is showing a high %sys in sar.
>
> Used cpuhog/iohog/memhog along with u386mon + top and nothing shows
> the offending process(es) - ps listings are normal. No sign of swapping.
> Resorted to brute force and killed process after process and sar
> still showing high %sys.
>
> Anyone any ideas?
>
> Running OSR 5.0.7 + Update Pack 2
> Single Pentium P4 + 512Mb Ram + Adaptec Raid
> HyperThreading Enabled.

Link scodb into the kernel ('Y' in /etc/conf/sdevice.d/scodb; relink;
reboot). While the problem is happening, do some ad hoc kernel
profiling by repeatedly breaking into scodb. At a text console
multiscreen, hit Ctrl-Alt-D. At the resulting scodb prompt, "b" (a
short alias for "stack"), then "q". Repeat many times. Get a feel for
what the kernel is doing when you expect it to be idle.

>Bela<