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Commit 98f6d57c authored by David Vrabel's avatar David Vrabel Committed by David S. Miller
Browse files

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: default avatarDavid Vrabel <david.vrabel@citrix.com>
[re-based]
Signed-off-by: default avatarPaul Durrant <paul.durrant@citrix.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c0b1a23

drivers/net/xen-netback/rx.c

+14 −1
Original line number Diff line number Diff line
@@ -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;