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

On Thu, 17 May 2012, Samuel Thibault wrote:

Samuel Thibault, le Fri 18 May 2012 01:28:21 +0200, a écrit :

quoted

Dave, Tushar N, le Thu 17 May 2012 23:22:31 +0000, a écrit :

quoted

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.