From 98f6d57ced73b723551568262019f1d6c8771f20 Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@citrix.com>
Date: Tue, 4 Oct 2016 10:29:16 +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 <david.vrabel@citrix.com>
[re-based]
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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 95487091763c..ae822b8fa76d 100644
--- a/drivers/net/xen-netback/rx.c
+++ b/drivers/net/xen-netback/rx.c
@@ -399,7 +399,7 @@ 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;
@@ -425,6 +425,19 @@ 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;