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Date: Mon, 24 Jul 2006 16:35:23 -0300
From: Marcelo Gardini do Amaral <marcelo@registro.br>
To: Scott Long <scottl@samsco.org>
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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
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> >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.

> 
> This might not apply to bge, but the adaptive polling + fast interrupt
> changes that I made to if_em earlier in the year were a huge win over
> the standard polling code in terms of CPU utilization and packets per
> second.  I think it also survived a load that caused normal polling to
> essentially livelock the machine.  And, it had the advantage of
> automatically adapting to bursty loads.

-- 
Att.,

Marcelo Gardini