From owner-freebsd-net@FreeBSD.ORG  Fri Sep 30 19:33:34 2005
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Date: Fri, 30 Sep 2005 12:33:33 -0700
From: Luigi Rizzo <rizzo@icir.org>
To: Andre Oppermann <andre@freebsd.org>
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In-Reply-To: <433D8417.D4666378@freebsd.org>;
	from andre@freebsd.org on Fri, Sep 30, 2005 at 08:29:43PM +0200
Cc: arch@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org>, net@freebsd.org
Subject: Re: [REVIEW/TEST] polling(4) changes
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On Fri, Sep 30, 2005 at 08:29:43PM +0200, Andre Oppermann wrote:
...
> > It adds a stub function call every tick. The function returns almost
> > immediately if no interfaces do polling.
> 
> If it does a FOREACH(interface) then it should stay as a kernel option.

this wasn't the case when i first wrote it - the list of
interfaces actually using polling was stored into an array and
the count was in a variable, so the loop was something like

	for (i=0; i < actively_polling_interfaces; i++)
		foo[i]->poll()

so it's basically just an extra function call per tick if
no interfaces are doing polling.

cheers
luigi