linux-toradex.git/net/rds/ib_ring.c, branch v3.9.8 Linux kernel for Apalis and Colibri modules RDS/IW+IB: Set recv ring low water mark to 1/2 full. 2009-04-10T00:21:14+00:00 Steve Wise swise@opengridcomputing.com 2009-04-09T14:09:36+00:00 5cd2fe6d54c91aa76893b3034f5f3473063c0202 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> 
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>
RDS/IB: Ring-handling code. 2009-02-27T07:39:30+00:00 Andy Grover andy.grover@oracle.com 2009-02-24T15:30:31+00:00 f528efe276ec16603b78f95fb63ca26b5b4c87dc Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>