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| author | mst@redhat.com <mst@redhat.com> | 2011-02-01 22:13:42 +0200 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2011-02-01 16:50:44 -0600 |
| commit | 5430a28fe452907c9e1b2097e073bc1ea4b29f39 (patch) | |
| tree | 066db9fdbac5a5ddca922b5d282161e9b6141b0e /hw/virtio.h | |
| parent | f157ed202e51dc2492b201dc34ed28e89c973fb7 (diff) | |
| download | qemu-5430a28fe452907c9e1b2097e073bc1ea4b29f39.zip qemu-5430a28fe452907c9e1b2097e073bc1ea4b29f39.tar.gz qemu-5430a28fe452907c9e1b2097e073bc1ea4b29f39.tar.bz2 | |
vhost: force vhost off for non-MSI guests
When MSI is off, each interrupt needs to be bounced through the io
thread when it's set/cleared, so vhost-net causes more context switches and
higher CPU utilization than userspace virtio which handles networking in
the same thread.
We'll need to fix this by adding level irq support in kvm irqfd,
for now disable vhost-net in these configurations.
Added a vhostforce flag to force vhost-net back on.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/virtio.h')
| -rw-r--r-- | hw/virtio.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/virtio.h b/hw/virtio.h index d8546d5..31d16e1 100644 --- a/hw/virtio.h +++ b/hw/virtio.h @@ -93,6 +93,7 @@ typedef struct { int (*load_config)(void * opaque, QEMUFile *f); int (*load_queue)(void * opaque, int n, QEMUFile *f); unsigned (*get_features)(void * opaque); + bool (*query_guest_notifiers)(void * opaque); int (*set_guest_notifiers)(void * opaque, bool assigned); int (*set_host_notifier)(void * opaque, int n, bool assigned); void (*vmstate_change)(void * opaque, bool running); |