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

[Samuel Thibault]

Brandeburg, Jesse, le Thu 17 May 2012 17:04:04 -0700, a écrit :
> 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.

How does it avoid filling the ring?  What is the purpose of the RXO flag
if it does avoid them?

Samuel
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