[PATCHv2 net] xen-netfront: request Tx response events more often

[PATCHv2 net] xen-netfront: request Tx response events more often

[David Vrabel]

From: Malcolm Crossley <malcolm.crossley@citrix.com>

Trying to batch Tx response events results in poor performance because
this delays freeing the transmitted skbs.

Instead use the standard RING_FINAL_CHECK_FOR_RESPONSES() macro to be
notified once the next Tx response is placed on the ring.

Signed-off-by: Malcolm Crossley <malcolm.crossley@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
---
v2:
- Use bool.
---
 drivers/net/xen-netfront.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index d6abf19..96ccd4e 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -364,6 +364,7 @@ static void xennet_tx_buf_gc(struct netfront_queue *queue)
 	RING_IDX cons, prod;
 	unsigned short id;
 	struct sk_buff *skb;
+	bool more_to_do;
 
 	BUG_ON(!netif_carrier_ok(queue->info->netdev));
 
@@ -398,18 +399,8 @@ static void xennet_tx_buf_gc(struct netfront_queue *queue)
 
 		queue->tx.rsp_cons = prod;
 
-		/*
-		 * Set a new event, then check for race with update of tx_cons.
-		 * Note that it is essential to schedule a callback, no matter
-		 * how few buffers are pending. Even if there is space in the
-		 * transmit ring, higher layers may be blocked because too much
-		 * data is outstanding: in such cases notification from Xen is
-		 * likely to be the only kick that we'll get.
-		 */
-		queue->tx.sring->rsp_event =
-			prod + ((queue->tx.sring->req_prod - prod) >> 1) + 1;
-		mb();		/* update shared area */
-	} while ((cons == prod) && (prod != queue->tx.sring->rsp_prod));
+		RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do);
+	} while (more_to_do);
 
 	xennet_maybe_wake_tx(queue);
 }
-- 
2.1.4

Re: [PATCHv2 net] xen-netfront: request Tx response events more often

[David Miller]

From: David Vrabel <david.vrabel@citrix.com>
Date: Tue, 26 Jan 2016 17:12:44 +0000

> From: Malcolm Crossley <malcolm.crossley@citrix.com>
> 
> Trying to batch Tx response events results in poor performance because
> this delays freeing the transmitted skbs.
> 
> Instead use the standard RING_FINAL_CHECK_FOR_RESPONSES() macro to be
> notified once the next Tx response is placed on the ring.
> 
> Signed-off-by: Malcolm Crossley <malcolm.crossley@citrix.com>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Applied.