em driver testing

Jack Vogel jfvogel at gmail.com
Tue Nov 7 21:50:59 UTC 2006

On 11/7/06, Mike Jakubik <mikej at rogers.com> wrote:
> Clayton Milos wrote:
> > Hi Jack
> >
> >
> > I patched the driver and re-compiled the kernel and userland.
> >
> > All appears well with the em driver now. No more errors on it.
> > I am getting watchdog timeouts on the xl driver now though. It was
> > happenning before at the same time as the em ones. Now I've passed a
> > lot of traffic on the em interface but the xl interface gets watchdog
> > errors. The em interface still works fine but the xl one is no usable
> > after this.
> Has it not been established by someone that the problem is in freebsd
> (scheduler iirc) and not the drivers themselves? This along with the
> bge/bce wtachdog timeouts seems to confirm that.

Yes, I think its pretty likely to be in the timer/clock code, something
must have changed.

However, I like the design change we made to em better anyway,
the net/if timer is UP design, and has ALWAYS been vulnerable to
races, its best to do what we did (its in patch yet and not checked
in btw).


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