kernel profiling?

[Kris Kennaway]

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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