[ofw] [PATCH] DAPL v2.0: common: increase default IB ack timer from 16 to 20

[Davis, Arlin R]

For larger, more congested fabrics, a larger ACK timer is needed.
Consumers can still change default with environment variable
DAPL_ACK_TIMER if they need to increase or decrease.

This applies to SCM and UCM providers only. The CMA provider, which
uses rdma_cm, has no way to control ack timer with current API.

Signed-off-by: Arlin Davis <arlin.r.davis at intel.com>
---
 dapl/openib_common/dapl_ib_common.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dapl/openib_common/dapl_ib_common.h b/dapl/openib_common/dapl_ib_common.h
index a0dd772..e757b65 100644
--- a/dapl/openib_common/dapl_ib_common.h
+++ b/dapl/openib_common/dapl_ib_common.h
@@ -158,8 +158,8 @@ typedef uint16_t		ib_hca_port_t;
 #define DAT_UD_QKEY	0x78654321
 
 /* RC timer - retry count defaults */
-#define DCM_ACK_TIMER	16 /* 5 bits, 4.096us*2^ack_timer. 16== 268ms */
-#define DCM_ACK_RETRY	7  /* 3 bits, 7 * 268ms = 1.8 seconds */
+#define DCM_ACK_TIMER	20 /* 5 bits, 4.096us*2^ack_timer. 16== 268ms, 20==4.2s */
+#define DCM_ACK_RETRY	7  /* 3 bits, 7 * 4.2  == 30 seconds */
 #define DCM_RNR_TIMER	12 /* 5 bits, 12 =.64ms, 28 =163ms, 31 =491ms */
 #define DCM_RNR_RETRY	7  /* 3 bits, 7 == infinite */
 #define DCM_IB_MTU	2048
-- 
1.7.3