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Re: [E1000-devel] Transmission limit

To: Scott Feldman <sfeldma@xxxxxxxxx>
Subject: Re: [E1000-devel] Transmission limit
From: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>
Date: Wed, 1 Dec 2004 19:29:43 +0100
Cc: jamal <hadi@xxxxxxxxxx>, Robert Olsson <Robert.Olsson@xxxxxxxxxxx>, P@xxxxxxxxxxxxxx, mellia@xxxxxxxxxxxxxxxxxxxx, e1000-devel@xxxxxxxxxxxxxxxxxxxxx, Jorge Manuel Finochietto <jorge.finochietto@xxxxxxxxx>, Giulio Galante <galante@xxxxxxxxx>, netdev@xxxxxxxxxxx
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On Tue, Nov 30, 2004 at 05:09:59PM -0800, Scott Feldman wrote:

> This doubles the kpps numbers for 60-byte packets.  I'd like to see what
> happens on higher bus bandwidth systems.  Anyone?

Dual Xeon 2.4GHz, a 82540EM and a 82541GI both on 32/66 on separate
PCI buses.

BEFORE performance is approx the same for both, ~620kpps.
AFTER performance is ~730kpps, also approx the same for both.

(Note: only sending with one NIC at a time.)

Once or twice it went into a state where it started spitting out these
kinds of messages and never recovered:

        Dec  1 19:13:18 phi kernel: NETDEV WATCHDOG: eth1: transmit timed out
        [...]
        Dec  1 19:13:31 phi kernel: NETDEV WATCHDOG: eth1: transmit timed out
        [...]
        Dec  1 19:13:43 phi kernel: NETDEV WATCHDOG: eth1: transmit timed out

But overall, looks good.  Strange thing that Robert's numbers didn't
improve.  Doing some more measurements right now.


--L

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