From 79e39fc67de9c1309ecce71a0d61a33214c5bfc3 Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Fri, 23 Sep 2016 13:12:14 +0100 Subject: [PATCH] xen-netback: process guest rx packets in batches Instead of only placing one skb on the guest rx ring at a time, process a batch of up-to 64. This improves performance by ~10% in some tests. Signed-off-by: David Vrabel [re-based] Signed-off-by: Paul Durrant --- drivers/net/xen-netback/rx.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/net/xen-netback/rx.c b/drivers/net/xen-netback/rx.c index 44d7ec97527a..03a7c0eb0b18 100644 --- a/drivers/net/xen-netback/rx.c +++ b/drivers/net/xen-netback/rx.c @@ -398,7 +398,7 @@ static void xenvif_rx_extra_slot(struct xenvif_queue *queue, BUG(); } -void xenvif_rx_action(struct xenvif_queue *queue) +void xenvif_rx_skb(struct xenvif_queue *queue) { struct xenvif_pkt_state pkt; @@ -424,6 +424,19 @@ void xenvif_rx_action(struct xenvif_queue *queue) xenvif_rx_complete(queue, &pkt); } +#define RX_BATCH_SIZE 64 + +void xenvif_rx_action(struct xenvif_queue *queue) +{ + unsigned int work_done = 0; + + while (xenvif_rx_ring_slots_available(queue) && + work_done < RX_BATCH_SIZE) { + xenvif_rx_skb(queue); + work_done++; + } +} + static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue) { RING_IDX prod, cons; -- 2.39.5