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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html