Date: Wed, 17 Nov 2004 14:08:25 -0500 From: Charles Swiger <cswiger@mac.com> To: Eugene Grosbein <eugen@grosbein.pp.ru> Cc: net@freebsd.org Subject: Re: polling(4) rocks! Message-ID: <0E8F462B-38CC-11D9-B242-003065ABFD92@mac.com> In-Reply-To: <20041117185248.GA1394@grosbein.pp.ru> References: <20041117181351.GA48071@comp.chem.msu.su> <20041117185248.GA1394@grosbein.pp.ru>
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On Nov 17, 2004, at 1:52 PM, Eugene Grosbein wrote: > On Wed, Nov 17, 2004 at 09:13:51PM +0300, Yar Tikhiy wrote: > [ ...praise of polling(4)... ] > Does polling(4) increase latency? It is very imortant for router > that handles lots of RTP (VoIP) traffic. Using polling does increase the latency of the traffic, slightly: if you follow the recommended configuration and set HZ=1000 or so, the added latency typically ends up being around 1ms. That's not enough to affect VoIP significantly. I've got 12 VoIP phone lines going through a FreeBSD 4.10 firewall using polling(4) over a T1 now. The firewall box is a Dell P3/400MHz or so using fxp and a quad-port card using the DEC 21x4x chipset. -- -Chuck
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