Re: [PATCH] e1000: Reset rx ring index on receive overrun

[Brandeburg, Jesse]

On Thu, 17 May 2012, Samuel Thibault wrote:

> Samuel Thibault, le Fri 18 May 2012 01:28:21 +0200, a écrit :
> > Dave, Tushar N, le Thu 17 May 2012 23:22:31 +0000, a écrit :
> > > I am interested in to see if you have actual test case and more 
> > > importantly test data that shows that kernel and device indexes are 
> > > not synchronized any more.
> > 
> > Well, it's not with an actual physical device, but with the kvm
> > emulation.
> 
> BTW, it also happens easily when request_irq takes some time to
> complete: since we enable E1000_TCTL_EN before that, the card can have
> time to fill the ring before irqs are processed.

I think there may well be a bug in the implementation in kvm.  The 
hardware doesn't have this bug.