[48052] in North American Network Operators' Group
Re: Linux routing
daemon@ATHENA.MIT.EDU (Ralph Doncaster)
Wed May 22 07:35:22 2002
Date: Wed, 22 May 2002 07:36:11 -0400 (EDT)
From: Ralph Doncaster <ralph@istop.com>
To: Peter van Dijk <peter@dataloss.nl>
Cc: "nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <20020522074545.GA51074@dataloss.nl>
Message-ID: <Pine.LNX.4.21.0205220735080.26165-100000@cpu1693.adsl.bellglobal.com>
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Errors-To: owner-nanog-outgoing@merit.edu
> 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
