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    SubjectRe: [RFC V7 PATCH 7/7] vhost_net: add interrupt coalescing support
    On Mon, 25 May 2015 01:24:04 -0400
    Jason Wang <jasowang@redhat.com> wrote:

    > Signed-off-by: Jason Wang <jasowang@redhat.com>
    > ---
    > drivers/vhost/net.c | 8 ++++++++
    > 1 file changed, 8 insertions(+)
    >
    > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
    > index 7d137a4..5ee28b7 100644
    > --- a/drivers/vhost/net.c
    > +++ b/drivers/vhost/net.c
    > @@ -320,6 +320,9 @@ static void handle_tx(struct vhost_net *net)
    > hdr_size = nvq->vhost_hlen;
    > zcopy = nvq->ubufs;
    >
    > + /* Finish pending interrupts first */
    > + vhost_check_coalesce_and_signal(vq->dev, vq, false);
    > +
    > for (;;) {
    > /* Release DMAs done buffers first */
    > if (zcopy)
    > @@ -415,6 +418,7 @@ static void handle_tx(struct vhost_net *net)
    > }
    > }
    > out:
    > + vhost_check_coalesce_and_signal(vq->dev, vq, true);
    > mutex_unlock(&vq->mutex);
    > }
    >
    > @@ -554,6 +558,9 @@ static void handle_rx(struct vhost_net *net)
    > vq->log : NULL;
    > mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF);
    >
    > + /* Finish pending interrupts first */
    > + vhost_check_coalesce_and_signal(vq->dev, vq, false);
    > +
    > while ((sock_len = peek_head_len(sock->sk))) {
    > sock_len += sock_hlen;
    > vhost_len = sock_len + vhost_hlen;
    > @@ -638,6 +645,7 @@ static void handle_rx(struct vhost_net *net)
    > }
    > }
    > out:
    > + vhost_check_coalesce_and_signal(vq->dev, vq, true);
    > mutex_unlock(&vq->mutex);
    > }
    >

    Could you implement ethtool control of these coalescing parameters?


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