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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