netdev - [PATCH 03/12] RDS/IW+IB: Set the RDS_LL_SEND

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Date:	Thu,  9 Apr 2009 17:09:38 -0700
From:	Andy Grover <andy.grover@...cle.com>
To:	netdev@...r.kernel.org
Cc:	rds-devel@....oracle.com, Steve Wise <swise@...ngridcomputing.com>
Subject: [PATCH 03/12] RDS/IW+IB: Set the RDS_LL_SEND_FULL bit when we're throttled.

From: Steve Wise <swise@...ngridcomputing.com>

The RDS_LL_SEND_FULL bit should be set when we stop transmitted due to
flow control.  Otherwise the send worker will keep trying as opposed to
sleeping until we unthrottle.  Saves CPU.

Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
Signed-off-by: Andy Grover <andy.grover@...cle.com>
---
 net/rds/ib_send.c |    2 +-
 net/rds/iw_send.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index cb6c52c..fa684b7 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -506,7 +506,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 			flow_controlled++;
 		}
 		if (work_alloc == 0) {
-			rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
+			set_bit(RDS_LL_SEND_FULL, &conn->c_flags);
 			rds_ib_stats_inc(s_ib_tx_throttle);
 			ret = -ENOMEM;
 			goto out;
diff --git a/net/rds/iw_send.c b/net/rds/iw_send.c
index 22dd38f..626290b 100644
--- a/net/rds/iw_send.c
+++ b/net/rds/iw_send.c
@@ -549,7 +549,7 @@ int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm,
 			flow_controlled++;
 		}
 		if (work_alloc == 0) {
-			rds_iw_ring_unalloc(&ic->i_send_ring, work_alloc);
+			set_bit(RDS_LL_SEND_FULL, &conn->c_flags);
 			rds_iw_stats_inc(s_iw_tx_throttle);
 			ret = -ENOMEM;
 			goto out;
-- 
1.5.6.3

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