On Wed, Sep 07, 2011 at 02:51:39PM +0100, Stefan Hajnoczi wrote: > This patch allows virtio-blk to release its block queue lock while kicking the > host. This improves scalability on SMP guests who would otherwise spin on the > lock while another vCPU is kicking the host. > > This approach can be used for other virtio devices too. It simply splits the > virtqueue_kick() operation into a prepare step which requires that the lock be > held and the actual notify step which may be performed without the lock. > Existing virtio drivers may continue to use the virtqueue_kick() interface > which now does the prepare and notify steps internally. > > I am sending this out as RFC because further performance benchmarking is > required. Although we have seen good results in the past, gathering number on > a wider range of machines and verifying that there is no regression would be > helpful. Makes sense to me. Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > Stefan Hajnoczi (2): > virtio_ring: split virtqueue_kick prepare/notify > virtio_blk: unlock vblk->lock during kick > > drivers/block/virtio_blk.c | 10 ++++++++-- > drivers/virtio/virtio_ring.c | 28 +++++++++++++++++++++------- > include/linux/virtio.h | 13 +++++++++++++ > 3 files changed, 42 insertions(+), 9 deletions(-) > > -- > 1.7.5.4 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
