linux-gen: sched: per priority burst size configuration

Change burst size configuration to be per priority instead of
only two levels of control (high/low priority). Also maximum
burst size is configurable, so that application may request
a large burst of events without a worry that a large burst of
low priority events is received.

Signed-off-by: Petri Savolainen <petri.savolainen@linaro.org>
Reviewed-by: Bill Fischofer <bill.fischofer@linaro.org>
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>

1 files changed, 14 insertions, 11 deletions

diff --git a/config/odp-linux-generic.conf b/config/odp-linux-generic.conf
index bddc92dd4..4fe02cf29 100644
--- a/config/odp-linux-generic.conf
+++ b/config/odp-linux-generic.conf
@@ -16,7 +16,7 @@
 
 # Mandatory fields
 odp_implementation = "linux-generic"
-config_file_version = "0.0.1"
+config_file_version = "0.1.0"
 
 # Shared memory options
 shm: {
@@ -73,14 +73,17 @@ sched_basic: {
 	# value is the number of threads using the scheduler.
 	prio_spread = 4
 
-	# Default burst sizes for high and low priority queues. The default
-	# and higher priority levels are considered as high. Scheduler
-	# rounds up number of requested events up to these values. In general,
-	# larger requests are not round down. So, larger bursts than these may
-	# received when requested. A large burst size improves throughput,
-	# but decreases application responsiveness to high priority events
-	# due to head of line blocking cause by a burst of low priority
-	# events.
-	burst_size_hi  = 32
-	burst_size_low = 16
+	# Burst size configuration per priority. The first array element
+	# represents the highest queue priority. The scheduler tries to get
+	# burst_size_default[prio] events from a queue and stashes those that
+	# cannot be passed to the application immediately. More events than the
+	# default burst size may be returned from application request, but no
+	# more than burst_size_max[prio].
+	#
+	# Large burst sizes improve throughput, but decrease application
+	# responsiveness to higher priority events due to head of line blocking
+	# caused by a burst of lower priority events.
+	burst_size_default = [ 32,  32,  32,  32,  32, 16,  8, 4]
+	burst_size_max     = [255, 255, 255, 255, 255, 16, 16, 8]
+
 }