Re: 8260 Communications Proccessor overload??

Kevin Fry wrote:

   Has anyone ever run all 3 FCC ports at the same time with a
100Mbit link?

Yeah.....

....  I think I'm seeing the Communications Processor get
overloaded, but Motorola claims there is no problem.

What clock speeds are you running?  Are they full or half duplex
connections?

the Ethernet PHY (AM79C874) indicates no errors, but the MAC is
reporting
CRC errors.

Hmmm...Do you ever see any buffering problems on the Linux driver
side, like the CPU can't keep up with the data?

.... I have captured the MAC --> PHY transfers on a logic
analyzer
and am decoding them at present (I hate computing a CRC-32 by hand).  I
was
hoping someone else has experience relative to this situation.

I have seen some noise problems with some boards between the MAC and
PHY.  Some crappy looking layouts worked great, some really pretty
ones had trouble :-).  I don't know if this would be represented as
a CRC error or something else.

Good Luck!  Keep us posted :-).


	-- Dan

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/