Date: Tue, 18 May 1999 14:50:01 -0700 (PDT) From: David Greenman <dg@root.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/11765: performance bug: network devices fxp : de perform Very slowly when both cards are in a single machine Message-ID: <199905182150.OAA59223@freefall.freebsd.org>
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The following reply was made to PR kern/11765; it has been noted by GNATS.
From: David Greenman <dg@root.com>
To: dave@educentre.com
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/11765: performance bug: network devices fxp : de perform Very slowly when both cards are in a single machine
Date: Tue, 18 May 1999 14:45:51 -0700
>>Description:
>
>If you have a de network card (Kingston)
>and an fxp network card (Intel) in a single
>machine then you can't get more than 14K/s
>xfer speed down the de network card.
>
>>How-To-Repeat:
>
>Machine A is multihomed.
>It has an fxp network card (e.g. used to talk to the net)
>and a de network card (used to talk to machine B)
>
>Machine B is singehomed.
>It has a de network card used only for talking with machine A.
>
>FTP GET on machine B from A (or vice versa) goes at max speed of 14K/s
>down a short:) length of UTP crossover.
>both de cards are talking 10baset/utp half duplex
>
>>Fix:
>
>Swapping the fxp card with machine B's de card
>(so that each machine contains just one type of card)
>restores performance to expected levels.
Sounds like an autonegotiation/duplex problem. I suggest forcing both sides
to 100/full.
-DG
David Greenman
Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org
Creator of high-performance Internet servers - http://www.terasolutions.com
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