On Sun, 2011-05-08 at 21:09 +0800, Asias He wrote:
> As virtio spec says:
>
> """
> Because this is high importance and low bandwidth, the current Linux
> implementation polls for the buffer to be used, rather than waiting
> for an interrupt, simplifying the implementation signicantly.
> """
>
> drivers/char/virtio_console.c
> send_buf() {
> ...
> /* Tell Host to go! */
> virtqueue_kick(out_vq);
> ...
> while (!virtqueue_get_buf(out_vq, &len))
> cpu_relax();
> ...
> }
>
> The console hangs can simply be reproduced by yes command which
> gives tremendous console IOs and IRQs.
Sasha, does this fix the hangs you were seeing? We should re-enable
virtio console unconditionally if this does - that increases test
coverage for virtio console.
Pekka
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