From owner-freebsd-net@FreeBSD.ORG  Sat Dec 13 10:17:12 2003
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Date: Sat, 13 Dec 2003 10:17:06 -0800
From: Luigi Rizzo <rizzo@icir.org>
To: Don Bowman <don@sandvine.com>
Message-ID: <20031213101706.A79791@xorpc.icir.org>
References: <FE045D4D9F7AED4CBFF1B3B813C85337035E418B@mail.sandvine.com>
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In-Reply-To: <FE045D4D9F7AED4CBFF1B3B813C85337035E418B@mail.sandvine.com>;
	from don@sandvine.com on Sat, Dec 13, 2003 at 10:50:33AM -0500
cc: 'DrumFire' <dpphln@tin.it>
cc: net@freebsd.org
Subject: Re: how to saturate 100Mbit
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On Sat, Dec 13, 2003 at 10:50:33AM -0500, Don Bowman wrote:
...
> There is a netgraph module called ng_source which can do this.
> It can achieve about 400Kpps or >1Gbps on a xeon system with
> a gigabit card, should be able to saturate a fxp.

the fxp has a problem which does not allow it to go above 103/110/120kpps
depending on which descriptor model you use, no matter how fast
the CPU is.

Even not using any special kernel modules, a simple loop over
a sendto() on a udp socket can achieve around 500kpps on a 2.4GHz
box (em or bge). With some tricks and a sufficiently fast PCI
bus you can reach some 750kpps but then it really depends
on how fast is your PCI bus.

	cheers
	luigi

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