Re: sky2 rx error problems...

["Daniel J Blueman" <daniel.blueman@gmail.com>]

Hi Stephen,

Sorry to bring you more trouble. I'm able to reproduce this 'status
0x977d977d' rx race even with a 100Mb FD connection (MTU 1500) to the
host sending the data.

Would it help if I try and capture some packet stats or a dump of
this? The packets being received at the sending host will be a steady
stream of TCP acks and SMB protocol acks (every 64KB of data), so not
too heavy. The sending host has a Pentium-M 1.7GHz with 2MB L2$ and is
quiescent apart from samba sending data via sendfile(), so is
relatively powerful.

Let me know if there is anything I can do to help.

Many thanks,
  Daniel

On 31/05/06, Stephen Hemminger <shemminger@osdl.org> wrote:
> On Tue, 30 May 2006 22:08:12 +0100
> "Daniel J Blueman" <daniel.blueman@gmail.com> wrote:
>
> > To follow on from the previous 'sky2 rx error' problem reported, the
> > problem doesn't have anything to do with iptables or MTU settings, ie
> > can be reproduced out the box.
> >
> > The race is hit after a couple of GBs of data. Initially, I thought
> > this may have something to do with broken MSI support on my Intel
> > ICH-7M chipset, but disabling MSI didn't help.
> >
> > kernel: sky2 lan0: rx error, status 0x977d977d length 0
> >
> > Is there any debug information I can get to help or such? Voluntary
> > preemption is enabled, UP, HZ=100 on 2.6.17-rc4 on i686.
> >
> > Dan
>
> No the problem is your CPU isn't keeping up with the incoming flood
> and what ever you are connected to doesn't do hardware flow control.
> The driver doesn't properly flush the FIFO (yet), and it is not clear
> even from the NDA documentation the steps required.
-- 
Daniel J Blueman