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Date: Sun, 6 Jul 2008 17:10:00 +0800
From: "Sepherosa Ziehau" <sepherosa@gmail.com>
To: Paul <paul@gtcomm.net>
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References: <4867420D.7090406@gtcomm.net> <486BC7F5.5070604@gtcomm.net>
	<20080703160540.W6369@delplex.bde.org> <486C7F93.7010308@gtcomm.net>
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Cc: FreeBSD Net <freebsd-net@freebsd.org>, Ingo Flaschberger <if@xip.at>
Subject: Re: Freebsd IP Forwarding performance (question,
	and some info) [7-stable, current, em, smp]
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On Sat, Jul 5, 2008 at 2:03 AM, Paul <paul@gtcomm.net> wrote:
> I tried all of this :/  still, 256/512 descriptors seem to work the best.
> Happy to let you log into the machine and fiddle around if you want :)

I think you need to ktr the packet processing time.  Standard gigabit
max at ~1488095pps, which means you could be @max rate only if each
packet's processing time is <= ~672ns.  Since you are using
fastforwarding, the calculation should be quite straightforward for
you; I don't think you should expect anything beyond the calculated
result.

Best Regards,
sephe

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