[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
State Rejected, archived
Delegated to: David Miller
Headers show

Commit Message

Andy Grover March 30, 2009, 6:44 p.m. UTC
From: Steve Wise <swise@opengridcomputing.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@opengridcomputing.com>
Signed-off-by: Andy Grover <andy.grover@oracle.com>
---
 net/rds/ib_ring.c |    2 +-
 net/rds/iw_ring.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Patch
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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);
 }