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Date: Tue, 4 Oct 2016 10:29:16 +0100 From: Paul Durrant <paul.durrant@...rix.com> To: <netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org> CC: David Vrabel <david.vrabel@...rix.com>, Paul Durrant <paul.durrant@...rix.com>, Wei Liu <wei.liu2@...rix.com> Subject: [PATCH v2 net-next 5/7] xen-netback: process guest rx packets in batches From: David Vrabel <david.vrabel@...rix.com> 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@...rix.com> [re-based] Signed-off-by: Paul Durrant <paul.durrant@...rix.com> --- Cc: Wei Liu <wei.liu2@...rix.com> --- 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 9548709..ae822b8 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; -- 2.1.4
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