netdev - [PATCH 2/9] RDS/IW+IB: Set recv ring low water mark to 1/2 full.

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Message-Id: <1238438693-29540-3-git-send-email-andy.grover@oracle.com>
Date:	Mon, 30 Mar 2009 11:44:46 -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 2/9] RDS/IW+IB: Set recv ring low water mark to 1/2 full.

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

Currently the recv ring low water mark is 1/4 the depth.  Performance
measurements show that this limits iWARP throughput by flow controlling
the rds-stress senders.  Setting it to 1/2 seems to max the T3
performance.  I tried even higher levels but that didn't help and it
started to increase the rds thread cpu utilization.

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

diff --git a/net/rds/ib_ring.c b/net/rds/ib_ring.c
index 99a6cca..ff97e8e 100644
--- a/net/rds/ib_ring.c
+++ b/net/rds/ib_ring.c
@@ -137,7 +137,7 @@ int rds_ib_ring_empty(struct rds_ib_work_ring *ring)

 int rds_ib_ring_low(struct rds_ib_work_ring *ring)
 {
-	return __rds_ib_ring_used(ring) <= (ring->w_nr >> 2);
+	return __rds_ib_ring_used(ring) <= (ring->w_nr >> 1);
 }

 /*
diff --git a/net/rds/iw_ring.c b/net/rds/iw_ring.c
index d422d4b..da8e3b6 100644
--- a/net/rds/iw_ring.c
+++ b/net/rds/iw_ring.c
@@ -137,7 +137,7 @@ int rds_iw_ring_empty(struct rds_iw_work_ring *ring)

 int rds_iw_ring_low(struct rds_iw_work_ring *ring)
 {
-	return __rds_iw_ring_used(ring) <= (ring->w_nr >> 2);
+	return __rds_iw_ring_used(ring) <= (ring->w_nr >> 1);
 }

-- 
1.5.6.3

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