Re: nve0: device timeout (1)

> Bachilo Dmitry wrote:
> > Patch, by the way, was rejected. I have edited if_nve.c by hands, just changed 
> 
> Yep. It looks as a workaround, not a fix.


   Right. It's a reasonable work-around, however, so people shouldn't be
afraid of using it. Here is my original message on this subject:


  In reply to...

  > It doesn't only run into timeouts, during some of these timeout the
  > machine or at least the keyboard hangs for about a minute.
  > 
  > Is there anything I can do to help debug this?

     I ran into this problem recently as well and spent some time diagnosing
  it. It's not that the cable isn't plugged in - rather it happens whenever
  the traffic levels are low.
     The problem is that the nvidia-supplied portion of the driver is defering
  the releasing of the completed transmit buffers and this occasionally
  results in if_timer expiring, causing the driver watchdog routine to be
  called ("device timeout"). The watchdog routine resets the card and the
  nvidia-supplied code sits in a high-priority loop waiting for the card
  to reset. This can take many seconds and your system will be hung until
  it completes.
     I have a work-around patch for the problem that I've attached to this
  email. It simply disables the watchdog. A real fix would involve accounting
  for the outstanding transmit buffers differently (or perhaps not at all -
  e.g. always attempt to call the nvidia-supplied code and if a queue-full
  error occurs, then wait for an interrupt before trying to queue more
  transmit packets).

Index: if_nve.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/nve/if_nve.c,v
retrieving revision 1.7.2.8
diff -c -r1.7.2.8 if_nve.c
*** if_nve.c	25 Dec 2005 21:57:03 -0000	1.7.2.8
--- if_nve.c	5 Jan 2006 00:12:45 -0000
***************
*** 943,949 ****
  			return;
  		}
  		/* Set watchdog timer. */
! 		ifp->if_timer = 8;
  
  		/* Copy packet to BPF tap */
  		BPF_MTAP(ifp, m0);
--- 943,949 ----
  			return;
  		}
  		/* Set watchdog timer. */
! 		ifp->if_timer = 0;
  
  		/* Copy packet to BPF tap */
  		BPF_MTAP(ifp, m0);

-DG

David Greenman-Lawrence
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