search for: 3939c50

Under heavy load vhost tx busypoll tend not to suppress vq kicks, which causes poor guest tx performance. The detailed scenario is described in commitlog of patch 2. Rx seems not to have that serious problem, but for consistency I made a similar change on rx to avoid rx wakeups (patch 3). Additionary patch 4 is to avoid rx kicks under heavy load during busypoll. Tx performance is greatly improved

...which variable is for which, tx or rx. Signed-off-by: Toshiaki Makita <makita.toshiaki at lab.ntt.co.jp> --- drivers/vhost/net.c | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 29756d8..3939c50 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -647,39 +647,39 @@ static void vhost_rx_signal_used(struct vhost_net_virtqueue *nvq) static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) { - struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX...

...run busypoll after the necessary work is done. Signed-off-by: Toshiaki Makita <makita.toshiaki at lab.ntt.co.jp> --- drivers/vhost/net.c | 35 ++++++++++++++++++++++------------- 1 file changed, 22 insertions(+), 13 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 3939c50..811c0e5 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -396,13 +396,10 @@ static inline unsigned long busy_clock(void) return local_clock() >> 10; } -static bool vhost_can_busy_poll(struct vhost_dev *dev, - unsigned long endtime) +static bool vhost_can_busy_poll(unsign...