Re: [Qemu-devel] How to lock-up your tap-based VM network

[Blue Swirl]

On 4/13/10, Blue Swirl <address@hidden> wrote:
> On 4/12/10, Paul Brook <address@hidden> wrote:
>  > > A major reason for this deadlock could likely be removed by shutting
>  >  > down the tap (if peered) or dropping packets in user space (in case of
>  >  > vlan) when a NIC is stopped or otherwise shut down. Currently most (if
>  >  > not all) NIC models seem to signal both "queue full" and "RX disabled"
>  >  > via !can_receive().
>  >
>  >
>  > No. A disabled device should return true from can_recieve, then discard the
>  >  packets in its receive callback. Failure to do so is a bug in the device. 
> It
>  >  looks like the virtio-net device may be buggy.
>
>
> Awesome, it looks like a longstanding bug with pcnet/lance has is
>  fixed by this change! OpenBSD installer would hang when receiving
>  packages, now it works!

I spoke too soon, networking works also without the patch now.