search for: f87ec75

On Fri, Sep 22, 2017 at 04:02:32PM +0800, Jason Wang wrote: > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f87ec75..8424166d 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > } > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq,...

On Fri, Sep 22, 2017 at 04:02:32PM +0800, Jason Wang wrote: > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f87ec75..8424166d 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > } > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq,...

...f-by: Jason Wang <jasowang at redhat.com> > --- > drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ > drivers/vhost/vhost.h | 3 +++ > 2 files changed, 58 insertions(+) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f87ec75..8424166d 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > } > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq,...

...f-by: Jason Wang <jasowang at redhat.com> > --- > drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ > drivers/vhost/vhost.h | 3 +++ > 2 files changed, 58 insertions(+) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f87ec75..8424166d 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > } > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq,...

...ff-by: Jason Wang <jasowang at redhat.com> > --- > drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ > drivers/vhost/vhost.h | 3 +++ > 2 files changed, 58 insertions(+) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f87ec75..8424166d 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > } > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq, &...

...ff-by: Jason Wang <jasowang at redhat.com> > --- > drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ > drivers/vhost/vhost.h | 3 +++ > 2 files changed, 58 insertions(+) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f87ec75..8424166d 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > } > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq, &...

...gt; > drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ > > > drivers/vhost/vhost.h | 3 +++ > > > 2 files changed, 58 insertions(+) > > > > > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > > > index f87ec75..8424166d 100644 > > > --- a/drivers/vhost/vhost.c > > > +++ b/drivers/vhost/vhost.c > > > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > > > } > > > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > > +int...

...gt; > drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ > > > drivers/vhost/vhost.h | 3 +++ > > > 2 files changed, 58 insertions(+) > > > > > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > > > index f87ec75..8424166d 100644 > > > --- a/drivers/vhost/vhost.c > > > +++ b/drivers/vhost/vhost.c > > > @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, > > > } > > > EXPORT_SYMBOL_GPL(vhost_dequeue_msg); > > > +int...

...will be the first user. Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ drivers/vhost/vhost.h | 3 +++ 2 files changed, 58 insertions(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index f87ec75..8424166d 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, } EXPORT_SYMBOL_GPL(vhost_dequeue_msg); +int vhost_prefetch_desc_indices(struct vhost_virtqueue *vq, + struct vring_used_elem *heads...

...at redhat.com> >> --- >> drivers/vhost/vhost.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ >> drivers/vhost/vhost.h | 3 +++ >> 2 files changed, 58 insertions(+) >> >> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c >> index f87ec75..8424166d 100644 >> --- a/drivers/vhost/vhost.c >> +++ b/drivers/vhost/vhost.c >> @@ -2437,6 +2437,61 @@ struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev, >> } >> EXPORT_SYMBOL_GPL(vhost_dequeue_msg); >> >> +int vhost_prefetch_desc_indi...

Hi: This series tries to implement basic tx batched processing. This is done by prefetching descriptor indices and update used ring in a batch. This intends to speed up used ring updating and improve the cache utilization. Test shows about ~22% improvement in tx pss. Please review. Jason Wang (5): vhost: split out ring head fetching logic vhost: introduce helper to prefetch desc index

Hi: This series tries to implement basic tx batched processing. This is done by prefetching descriptor indices and update used ring in a batch. This intends to speed up used ring updating and improve the cache utilization. Test shows about ~22% improvement in tx pss. Please review. Jason Wang (5): vhost: split out ring head fetching logic vhost: introduce helper to prefetch desc index

...igned-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 75 +++++++++++++++++++++++++++++++++------------------ drivers/vhost/vhost.h | 5 ++++ 2 files changed, 54 insertions(+), 26 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index d6dbb28..f87ec75 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1984,41 +1984,23 @@ static int get_indirect(struct vhost_virtqueue *vq, return 0; } -/* This looks in the virtqueue and for the first available buffer, and converts - * it to an iovec for convenient access. Since descriptors c...