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Message
From: "Igor Mohor\(opencores\)" <igorm@o...>
Date: Tue, 17 Jun 2003 21:38:45 +0200
Subject: RE: [openrisc] Ethernet Core Performance
Regarding your "slow" connection here is what happened to me:
When I received a frame it was discarded due to buffer overrun. My
connection to RAM was so slow that many packets were dropped.
At the beginning of the communication an arp packet is send. If there is
No reply it takes several seconds until another request is send. The
same
goes for all other packets. I'm pretty sure you have the same problem.
Out system was running at 25 MHz and I was able to transfer data at
approx. 40 Kbps (@ 10Mbps connection).
Regards,
Igor
> -----Original Message-----
> From: owner-openrisc@o...
[mailto:owner-openrisc@o...]
> On Behalf Of Michael McAllister
> Sent: Tuesday, June 17, 2003 9:10 PM
> To: openrisc@o...
> Subject: [openrisc] Ethernet Core Performance
>
> Hi guys-
>
> I am getting very close to getting the whole OpenRISC processor &
> peripherals up & running on my FPGA. I am now working the Ethernet
> controller; we are using an Intel LXT972A for the PHY. I am able to
> ping & FTP, but have two issues.
>
> 1) The response seems VERY slow. Our processor is running at 20MHz...
> is can take tens of seconds to start an FTP session to a remote host,
> and the xfer rate is terrible (BYTES per second on a 100Mbps
> connection).
>
> 2) I am having difficulty with TELNET. I can telnet to another
machine,
> but not login. It seems that the program is not receiving input from
> stdin; I am using a serial line & the UART core. When I run the
> program:
> /bin> telnet 132.158.1.28
> Trying 132.158.1.28(23)...
> Connected to 132.158.1.28.
> Escape character is '^]'.
> Red Hat Linux release 7.3 (Valhalla)
> Kernel 2.4.18-3 on an i686
> login:
>
> then, after a minute or so, I get:
>
> Connection closed by foreign host.
> /bin>
>
> and the shell receives input normally. Anyone else seen this?
>
> With sincere thanks,
> Michael McAllister
>
>
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