Date: Mon, 24 Jul 2006 13:40:45 -0600 From: Scott Long <scottl@samsco.org> To: Marcelo Gardini do Amaral <marcelo@registro.br> Cc: Peter Jeremy <peterjeremy@optushome.com.au>, freebsd-stable@freebsd.org, Ed Maste <emaste@phaedrus.sandvine.ca> Subject: Re: How to setup polling on 'bge' interface Message-ID: <44C5223D.5010707@samsco.org> In-Reply-To: <20060724193523.GB51092@registro.br> References: <20060711190908.GC69272@registro.br> <20060720023856.GA65960@sandvine.com> <20060720112613.GB716@turion.vk2pj.dyndns.org> <44BFA2EE.7060308@samsco.org> <20060724193523.GB51092@registro.br>
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Marcelo Gardini do Amaral wrote: >>>The limited testing I've done on a Sun V20z at work suggests that you >>>can get better routing throughput in interrupt mode than polling mode. >>>YMMV and this is before tweaking the polling parameters. (My testing >>>also suggests that I don't really need to do any tweaking because >>>the limiting factor is the gigabit interfaces rather than the V20z). > > > I've noticed a higher (and variable) RTT with polling mode activated, > without tweaking any parameters. > Yes, the RTT will vary based on whether the interface has to wait a full tick or only a partial tick for the polling loop to become active. Adaptive polling eliminates most of this variance. Scott
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