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authorSteve Wise <swise@opengridcomputing.com>2009-04-09 14:09:36 +0000
committerDavid S. Miller <davem@davemloft.net>2009-04-09 17:21:14 -0700
commit5cd2fe6d54c91aa76893b3034f5f3473063c0202 (patch)
treee2ffb6f8a3b9919326c1da62729aa2b542cdd017 /net/rds
parenta0c31fdfb7f158780faa43ab83cc08b414bebd7e (diff)
downloadop-kernel-dev-5cd2fe6d54c91aa76893b3034f5f3473063c0202.zip
op-kernel-dev-5cd2fe6d54c91aa76893b3034f5f3473063c0202.tar.gz
RDS/IW+IB: Set recv ring low water mark to 1/2 full.
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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
-rw-r--r--net/rds/ib_ring.c2
-rw-r--r--net/rds/iw_ring.c2
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);
}
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