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Re: [E1000-devel] Transmission limit

To: Marco Mellia <mellia@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [E1000-devel] Transmission limit
From: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>
Date: Mon, 29 Nov 2004 20:08:08 +0100
Cc: e1000-devel@xxxxxxxxxxxxxxxxxxxxx, Jorge Manuel Finochietto <jorge.finochietto@xxxxxxxxx>, Giulio Galante <galante@xxxxxxxxx>, netdev@xxxxxxxxxxx
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On Mon, Nov 29, 2004 at 06:32:13PM +0100, Marco Mellia wrote:

> Using the Agilent Router tester as receiver...
> :-(

OK, so you're measuring the inter-packet gap and in that burst of 11
(or whatever many) packets it's 96 bit times between every packet, yes?

Interesting.  Can you also try 'pre-loading' the TX ring with a bunch of
packets and then writing the values 0, 1, 2, 3 ... n-1 to the TXD register
with back-to-back MMIO writes (instead of doing a single write of the
value 'n'), and check what inter-packet gap you get then?


cheers,
Lennert

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