Re: [Qemu-devel] [PATCH 0/2] e1000: Introducing an upper bound of interrupts

[Jason Wang <jasowang@redhat.com>]

On 03/17/2016 03:37 PM, Sameeh Jubran wrote:
> This patch series introduces an upper bound for the number of interrupts
> per second. This feature is supported by the real hardware, however up
> until now it wasn't implemented in e1000. This feature is very
> significant, it can prevent an interrupt storm by giving the driver
> a bounded inter-interrupt interval to handle interrupts.
>
> This patch was made after observing an interrupt storm in Windows 10
> when disabling e1000.
>
> How reproducible:
>
> Steps to reproduce:
> 1. Start Win 10 guest with e1000 device.
> 2. Go to device manager and try to disable and enable the device.
> 3. After several enable/disable to the device the guest hangs when
> the device is being disabled.
>
> Actual results:
> Guest hang after click OK button.
>
> Expected results:
> Device is disabled.
>
> After applying the patch the guest no longer hangs, and an Iperf test
> ran successfully.
>
> Sameeh Jubran (2):
>   e1000: Fixing interrupts pace.
>   Revert "e1000: fix hang of win2k12 shutdown with flood ping"
>
>  hw/net/e1000.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
>

Applied.

Thanks Sameeh