linux-gen: sched: add spread weight config file option

Add new config file option to control scheduler internal queue
preference ratio.

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, 20 insertions, 6 deletions

diff --git a/config/odp-linux-generic.conf b/config/odp-linux-generic.conf
index af651d7f6..2417d23f2 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 = "0.1.1"
+config_file_version = "0.1.2"
 
 # Shared memory options
 shm: {
@@ -80,13 +80,27 @@ queue_basic: {
 }
 
 sched_basic: {
-	# Priority level spread. Each priority level is spread into multiple
-	# scheduler internal queues. A higher spread value typically improves
-	# parallelism and thus is better for high thread counts, but causes
-	# uneven service level for low thread counts. Typically, optimal
-	# value is the number of threads using the scheduler.
+	# Priority level spread
+	#
+	# Each priority level is spread into multiple scheduler internal queues.
+	# This value defines the number of those queues. Minimum value is 1.
+	# Each thread prefers one of the queues over other queues. A higher
+	# spread value typically improves parallelism and thus is better for
+	# high thread counts, but causes uneven service level for low thread
+	# counts. Typically, optimal value is the number of threads using
+	# the scheduler.
 	prio_spread = 4
 
+	# Weight of the preferred scheduler internal queue
+	#
+	# Each thread prefers one of the internal queues over other queues.
+	# This value controls how many times the preferred queue is polled
+	# between a poll to another internal queue. Minimum value is 1. A higher
+	# value typically improves parallelism as threads work mostly on their
+	# preferred queues, but causes uneven service level for low thread
+	# counts as non-preferred queues are served less often
+	prio_spread_weight = 63
+
 	# 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