mpc5200 fec error

[Eric Millbrandt]

-----Original Message-----
From: Wolfram Sang [mailto:w.sang at pengutronix.de] 
Sent: Tuesday, May 19, 2009 16:57
To: Robert Schwebel
Cc: Eric Millbrandt; linuxppc-dev at ozlabs.org
Subject: Re: mpc5200 fec error

On Tue, May 19, 2009 at 10:36:45PM +0200, Robert Schwebel wrote:
> Wolfram, have you seen this mail? You recently tested -rt on 2.6.29,
> right? Did you only test that on the customer hardware or also on the
> phyCORE-MPC5200B?

So far, I tried only on customer hardware, and that was 2.6.29.2-rt11.
With
that setup, I could work with NFS flawlessly, no real stress-testing
though.
Testing latest .3-rt is on my todo, will check the phyCOREs, too.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang
|
Industrial Linux Solutions                 | http://www.pengutronix.de/
|

I am able to reproduce the error using 2.6.29.2-rt11.  I was able to
mitigate the problem by raising the priority of the transmit irq.
However when running an NFS server on the pcm030 under high cpu load I
now get

[  132.477503] net eth0: FEC_IEVENT_RFIFO_ERROR
[  132.892329] net eth0: FEC_IEVENT_RFIFO_ERROR
[  133.884109] net eth0: FEC_IEVENT_RFIFO_ERROR
[  134.876059] net eth0: FEC_IEVENT_RFIFO_ERROR

Raising the priority of the rx irq does not seem to fix this problem
though.


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