The level. see linux/Documentation/kernel-parameters.txt
Also worth looking at is http://oss.sgi.com/projects/kernprof/
> next is this an accurate way to measure heady traffic load through
> say a linux router?
I presume you don't want to actually measure traffic throughput
as there are obviously other ways to do this.
> will it highlight all functions say for example
> ip_forward, dev_queue_xmit etc etc that are being opverloaded due to
> huge traffic loads being passed through the router. ie will it spot
> bottlenecks with good accuracy?
yes that's the idea.
> any feedback is welcomed,
> regards will.
Also note CONFIG_NET_PROFILE=Y which writes more network specific
profile data to /proc/net/profile, which you'll have to figure
out how to parse.
Also I think it was reported that there were some problems
with profiling (missing symbols) around 2.5.8? I don't know
whether it's been fixed.
Also I don't think you can profile modules, but there was a patch...
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