Re: Poor 8260 FCC Ethernet performance

["Mark Chambers" <markc@mail.com>]

Hi Adisorn,

You should probably try monitoring your network with Ethereal or something
similar to see what the problem really is - in other words make sure that
the problem really is packets coming out of your board too slowly.

Mark Chambers

----- Original Message -----
From: "Adisorn Ermongkonchai" <aermongk@yahoo.com>
To: <acurtis@onz.com>
Cc: <linuxppc-embedded@lists.linuxppc.org>
Sent: Sunday, June 06, 2004 2:00 PM
Subject: Poor 8260 FCC Ethernet performance


>
> Hi Allen and Linuxppc-embedded guru,
>
> Referring to your 31 May 2002 post to LinuxPPC about
> poor 8260 FCC Ether performance.  Did you figure
> out why is the FCC so slow?  We have encountered this
> problem as well. We use the newer MPC8270 with 400MHz
> clock and 200MHz CPM speed with BCM5222 PHY.  It
> ended up running at only ~5Mbps on 100Mbps Ethernet
> line.  We just tried 1 FCC.
>
> Does anyone on this post see the same problem? We use
> linux 2.4.18 with PPC pqii driver (somehow the other
> driver didn't seem to work for all 3 FCC's)  We
> also tried on Motorola 8260 eval board and the result
> is the same.  We also tried MEN Micro F6, it gave
> better result from 11MBps to 30Mbps.  We also tried
> just uboot to eliminate Linux out of the picture and
> the result was about the same.
>
> I was about to give up on this MPC8270 then I saw this
> post so I thought I try.  I cannot believe that
> Motorola would make a chip that support 3 FCC's
> but can only run at this ridiculous speed.  I am
> software engineer, this could be hardware.
>
> Can anyone help me on this?  I'm about to have to
> change the processor to PowerPC 4xx.
>
> Thanks in advance.
>
> Regards,
> Adisorn Ermongkonchai
>
>
>


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