# HG changeset patch
# User Jose Renato Santos <jsantos@hpl.hp.com>
# Date 1234495286 28800
# Node ID ef3f0e30f1b2b36b5088f222f75e940b18825cd3
# Parent  e28f1bf386e71c5525c035d7e5de1c29f9696fe1
Use new flag on packet message to reduce number of events due to message finish packets. Request event notification only after a fixed number of fragments have been sent.

diff -r e28f1bf386e7 -r ef3f0e30f1b2 drivers/xen/netchannel2/netchannel2_core.h
--- a/drivers/xen/netchannel2/netchannel2_core.h	Thu Feb 12 19:14:52 2009 -0800
+++ b/drivers/xen/netchannel2/netchannel2_core.h	Thu Feb 12 19:21:26 2009 -0800
@@ -28,6 +28,11 @@ static inline void DEBUGMSG(const char *
 #define ENTER() DEBUGMSG("===>")
 #define EXIT() DEBUGMSG("<===")
 #define RETURN(x) do { EXIT(); return (x); } while (0)
+
+/* After we send this number of frags, we request the
+ * other end to notify us when sending the corresponding
+ * finish packet message */
+#define MAX_COUNT_FRAGS_NO_EVENT 192
 
 /* Very small packets (e.g. TCP pure acks) are sent inline in the
  * ring, to avoid the hypercall overhead.  This is the largest packet
@@ -319,6 +324,11 @@ struct netchannel2_ring_pair {
            to keep outstanding at one time.  Valid whenever
            is_attached is set. */
         unsigned max_tx_packets_outstanding;
+
+	/* Count number of frags that we have sent to the other side
+	   When we reach a max value we request that the other end
+	   send an event when sending the corresponding finish message */
+	unsigned count_frags_no_event;
 
         /* Set if we need to send a SET_MAX_PACKETS message.
            Protected by the lock. */
diff -r e28f1bf386e7 -r ef3f0e30f1b2 drivers/xen/netchannel2/rscb.c
--- a/drivers/xen/netchannel2/rscb.c	Thu Feb 12 19:14:52 2009 -0800
+++ b/drivers/xen/netchannel2/rscb.c	Thu Feb 12 19:21:26 2009 -0800
@@ -437,7 +437,11 @@ void prepare_xmit_grant(struct netchanne
         else
                 tp->msg.type = NC2_PACKET_TYPE_receiver_map;
 
-	tp->msg.flags |= NC2_PACKET_FLAG_need_event;
+	ncrp->count_frags_no_event += tp->nr_fragments;
+	if (ncrp->count_frags_no_event >= MAX_COUNT_FRAGS_NO_EVENT) {
+		tp->msg.flags |= NC2_PACKET_FLAG_need_event;
+		ncrp->count_frags_no_event = 0;
+	}
 
         for (cur_skb = tp->skb;
              cur_skb != NULL;