hwqueue: keystone: Tune QoS rate parameters for smoother output

With larger WRR credit values comes higher throughput, but the output
can become "bursty". This patch lowers the initial byte credit target
from 1500 to 50, resulting in "smoother" output rates while not causing
excessive overhead in the 10000:1 case.

Signed-off-by: Reece R. Pollack <x0183204@ti.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/hwqueue/keystone_qos.h b/drivers/hwqueue/keystone_qos.h
index 94a1396025a..ce93ae14ae7 100644
--- a/drivers/hwqueue/keystone_qos.h
+++ b/drivers/hwqueue/keystone_qos.h
@@ -67,12 +67,12 @@
 #define QOS_WRR_PACKET_SHIFT            17
 #define QOS_WRR_BYTE_SHIFT              8
 
-#define QOS_BYTE_NORMALIZATION_FACTOR   (1500u << QOS_WRR_BYTE_SHIFT)
+#define QOS_BYTE_NORMALIZATION_FACTOR   (50u << QOS_WRR_BYTE_SHIFT)
 #define QOS_PACKET_NORMALIZATION_FACTOR (2u << QOS_WRR_PACKET_SHIFT)
 
 #define QOS_MAX_WEIGHT                  U32_MAX
-#define QOS_MAX_CREDITS                 S32_MAX
-#define QOS_MIN_CREDITS_WARN            100
+#define QOS_MAX_CREDITS                 0x1fffffff
+#define QOS_MIN_CREDITS_WARN            (50u << QOS_WRR_BYTE_SHIFT)
 
 #define to_qnode(_n)    container_of(_n, struct khwq_qos_tree_node, node)