Commit 5cd2fe6d authored by Steve Wise's avatar Steve Wise Committed by David S. Miller
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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: default avatarSteve Wise <>
Signed-off-by: default avatarAndy Grover <>
Signed-off-by: default avatarDavid S. Miller <>
parent a0c31fdf
......@@ -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);
......@@ -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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