freebsd stable - Oct 2006 - kernel profiling?

Hiya,

Whats the "right" way to grab kernel profiling data these days?

I've tried using the kernel profiling w/ kgmon and gprof but the top CPU
wasters are the profiling functions themselves, quickly followed by
write_eflags(). I'm not sure this is valid at all.

I'm running 6-stable on an Athlon 1800XP, so its uniprocessor and
(relatively) slow. I'm hitting the server rather hard with a few thousand
TCP connections a second; I'm trying to figure out where my ~60% of kernel
time and ~35% of interrupt time is going.

Thanks,



Adrian

-- 
Adrian Chadd - adrian@freebsd.org

On Mon, Oct 16, 2006 at 10:53:36AM +0800, Adrian Chadd
wrote:
> Hiya,
> 
> Whats the "right" way to grab kernel profiling data these days?
> 
> I've tried using the kernel profiling w/ kgmon and gprof but the top
CPU
> wasters are the profiling functions themselves, quickly followed by
> write_eflags(). I'm not sure this is valid at all.
> 
> I'm running 6-stable on an Athlon 1800XP, so its uniprocessor and
> (relatively) slow. I'm hitting the server rather hard with a few
thousand
> TCP connections a second; I'm trying to figure out where my ~60% of
kernel
> time and ~35% of interrupt time is going.
pmc can be extremely useful although it doesn't do call graphs.

Kris
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