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Subject: Re: [patch] ns83820 0.17
From: "Trever L. Adams" <tadams-lists@myrealbox.com>
To: "David S. Miller" <davem@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 12 Mar 2002 13:12:32 -0500
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On Tue, 2002-03-12 at 06:15, David S. Miller wrote:

> Use a cross-over cable to play with Jumbo frames, that is
> what I do :-)
> 
> Later this week I'll rerun tests on all the cards I have
> (Acenic, Sk98, tigon3, Natsemi etc.) with current drivers
> to see what it looks like with both jumbo and non-jumbo
> mtus over gigabit.

I no longer have the original, so I will just have to respond to this
one, since it is related.  I know I know nearly nothing about
networking, but here has been my thinking.

David, you believe we don't need NAPI.  You believe we perform fine
without it.  Here is my question.  A PCI bus, IRC, has about 500
Megabytes/sec of bandwidth.  A full blown gigabit Ethernet stream should
be around 133 Megabytes/sec.  Sounds to me like a PC could act easily
(As far as bandwidth is concerned) as a 4 to 5 port gigabit Ethernet
router.

How well does this work with NAPI and how well does it work without?  Is
NAPI a gain here?

Maybe there are other issues involved that I am unaware of, if there
are, I would still like to see how the theoretical answers pan out.

Thank you,
Trever Adams

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