From: "Michael Chan" <mchan@broadcom.com>
Date: Thu, 11 Mar 2010 09:49:56 -0800

On Wed, 2010-03-10 at 18:09 -0800, Brian Haley wrote:

quoted

quoted

quoted

I'm able to cause a netdev_watchdog timeout by changing the coalesce
settings on my bnx2, I built a little test program for it:

Do you run this program in a loop?  How quickly do you see the NETDEV
WATCHDOG?

It's run once, and we see it almost immediately after ETHTOOL_SCOALESCE.

What's the difference between running the test program and doing ethtool
-C?  Do you see the issue in either case?  I don't see the issue here
with ethtool -C.

Probably because the independent program runs faster and thus
can trigger races more easily.

In any case, you should be trying to reproduce his problem with
his test program since he went through the effort of providing
one.