From: Conn Clark <clark@esteem.com>
To: Jim Lin <jimmlin@solomon.com.tw>
Cc: May Ling List <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: Poor 8xx SCC Ethernet mode performence..
Date: Tue, 16 Jul 2002 10:29:58 -0700 [thread overview]
Message-ID: <3D345816.EF88C2D3@esteem.com> (raw)
In-Reply-To: NFBBLLKCILMGHKJGDFGHEEMACCAA.jimmlin@solomon.com.tw
Jim Lin wrote:
>
> Hi .
>
> I was testing SCC ethernet performance at our 850 custom board and found somting interesting.
>
> 1. Tested FTP Transfer about 20MB file with 10T hub I got about 250 k bps (someting poor ..)
> 2. and I found the hhl20 arch/ppc/8xx_io/enet.c source code NOT enable full duplex ..
> and I had pmsr added SCC_PMSR_FDE | SCC_PMSR_LPB .. and compiling , tested FTP Transfer again.
> I got about 200 Kbps!
>
> I do not understand what is happen? Has anyone experience this?
>
I know for a fact that the 850 can do 10Mbits . Check and see what the download
rate is from your ftp host using a different computer. Your 850 board should be
about the same speed.
If your 850 board isn't try looking at the Tx and Rx ethernet data lines with an
oscilliscope. If the activity on the lines seems to corespond to the with the
datarate you have a software problem. If the activity is signifigantly greater
you probably have a analog problem. Double check the turns ratio on your magnet
and make sure it is what your phy needs.
Good luck
Conn
--
*****************************************************************
If you live at home long enough, your parents will move out.
(Warning they may try to sell their house out from under you.)
*****************************************************************
Conn Clark
Engineering Stooge clark@esteem.com
Electronic Systems Technology Inc. www.esteem.com
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-07-16 17:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-16 9:37 Poor 8xx SCC Ethernet mode performence Jim Lin
2002-07-16 17:29 ` Conn Clark [this message]
[not found] <FFECLICFNBJAHONLGAKMKEGICFAA.gklug@giga-stream.de>
2002-07-17 3:39 ` Jim Lin
-- strict thread matches above, loose matches on Subject: below --
2002-07-17 20:11 Jean-Denis Boyer
2002-07-18 1:32 ` Jim Lin
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