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Date: Thu, 18 Nov 2004 01:52:49 +0700
From: Eugene Grosbein <eugen@grosbein.pp.ru>
To: Yar Tikhiy <yar@comp.chem.msu.su>
Message-ID: <20041117185248.GA1394@grosbein.pp.ru>
References: <20041117181351.GA48071@comp.chem.msu.su>
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cc: net@freebsd.org
Subject: Re: polling(4) rocks!
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On Wed, Nov 17, 2004 at 09:13:51PM +0300, Yar Tikhiy wrote:

> The router box is a 1.4GHz Celeron PC with an fxp(4) interface split
> across a dozen of vlans.  There is nothing special about its setup
> except for ~250 rules loaded into ipfw2.  It is running 4.10-RELEASE.
> Without polling, it was able to switch full 10Mbytes/sec of traffic
> (~9kpps), but that took from 50 to 70% CPU time spent in interrupts.
> With polling on, interrupt time never exceeds 5% and it stays as low
> as 1-2% on average even when traffic is that high.

Does polling(4) increase latency? It is very imortant for router
that handles lots of RTP (VoIP) traffic.

Eugene