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Re: [Qemu-devel] virtio-scsi-pci iothread spins at 100%
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] virtio-scsi-pci iothread spins at 100% |
Date: |
Thu, 9 Feb 2017 13:39:17 +0800 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, 02/08 19:44, Ed Swierk wrote:
> On Wed, Feb 8, 2017 at 6:52 PM, Fam Zheng <address@hidden> wrote:
> > This means virtio-scsi event vq handler is returning true but actually no
> > progress is made. Can you try the following patch to see if it's because a
> > stalled cache of VQ index?
> >
> > diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
> > index 6365706..7f7ab57 100644
> > --- a/hw/virtio/virtio.c
> > +++ b/hw/virtio/virtio.c
> > @@ -2126,7 +2126,7 @@ static bool virtio_queue_host_notifier_aio_poll(void
> > *opaque)
> > EventNotifier *n = opaque;
> > VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
> >
> > - if (virtio_queue_empty(vq)) {
> > + if (vring_avail_idx(vq) == vq->last_avail_idx) {
> > return false;
> > }
>
> I tried this change but the behavior is the same, unfortunately.
Hmm, maybe I'm missing something. How about this:
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index ce19eff..8b23e80 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -754,9 +754,7 @@ out:
void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq)
{
- if (s->events_dropped) {
- virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
- }
+ virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
}
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)