From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Durrant Subject: [PATCH v2 net-next 5/7] xen-netback: process guest rx packets in batches Date: Tue, 4 Oct 2016 10:29:16 +0100 Message-ID: <1475573358-32414-6-git-send-email-paul.durrant@citrix.com> References: <1475573358-32414-1-git-send-email-paul.durrant@citrix.com> Mime-Version: 1.0 Content-Type: text/plain Cc: David Vrabel , Paul Durrant , Wei Liu To: , Return-path: Received: from smtp02.citrix.com ([66.165.176.63]:54781 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932196AbcJDJtJ (ORCPT ); Tue, 4 Oct 2016 05:49:09 -0400 In-Reply-To: <1475573358-32414-1-git-send-email-paul.durrant@citrix.com> Sender: netdev-owner@vger.kernel.org List-ID: From: David Vrabel 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 --- Cc: Wei Liu --- 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