Date: Thu, 18 Nov 2004 01:52:49 +0700 From: Eugene Grosbein <eugen@grosbein.pp.ru> To: Yar Tikhiy <yar@comp.chem.msu.su> Cc: net@freebsd.org Subject: Re: polling(4) rocks! Message-ID: <20041117185248.GA1394@grosbein.pp.ru> In-Reply-To: <20041117181351.GA48071@comp.chem.msu.su> References: <20041117181351.GA48071@comp.chem.msu.su>
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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
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