North American Network Operators Group
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Re: Linux routing

  • From: Ralph Doncaster
  • Date: Wed May 22 07:36:55 2002 
> On Tue, May 21, 2002 at 06:34:47PM -0400, Ralph Doncaster wrote:
> > I don't really trust the vmstat system time numbers.  Based on some
> > suggestions I received, I ran some CPU intensive benchmarks during
> > different traffic loads, and determined how much system time was being
> > used by comparing the real and user times.  The results seem to show that
> > if I want to do 50Mbps full-duplex on 2 ports (200M aggregate) that the
> > standard Linux 2.2.20 routing code won't cut it.
> [snip bogus benchmark]
> 
> Why are you benchmarking network troughput by bzip2'ing a file in
> /tmp? It makes no sense.

interrupts are taking up CPU time, and vmstat is not accurately reporting
it.  I need *something* compute intensive to infer load by seeing how many
cycles are left over.

-Ralph