vsock/virtio: reduce credit update messages
In order to reduce the number of credit update messages, we send them only when the space available seen by the transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE. Signed-off-by:Stefano Garzarella <sgarzare@redhat.com> Reviewed-by:
Stefan Hajnoczi <stefanha@redhat.com> Acked-by:
Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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