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Date: Tue, 24 Mar 2009 15:14:33 +0200
From: Alexander Motin <mav@FreeBSD.org>
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To: Andrey Kropachev <andrey.kropachev@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: dummynet and smp
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Andrey Kropachev wrote:
> Is there an opportunity to scale dummynet on a number of cpu's? Currently my
> router processes about 200Mbit/s and around 50kpps. The dummynet takes about
> 80% of one processor. So, can dummynet be scaled, or can i somehow decrease
> the cpu usage of dummynet?

Dummynet itself quite effective. The 80% you see is probably some other
routines called after packets leaving dummynet. So you should try to
optimize other things as much as possible. 200Mbit/s and 50kpps is a
quite moderate traffic now.

Dummynet queue handler is really single-threaded, so the only thing you
can do is to enable new dummynet feature, that allows to bypass delay
when queue is not congested.

-- 
Alexander Motin