Explain a bit the magic of dividing by 2

1 files changed, 2 insertions, 0 deletions

diff --git a/config-model/src/main/java/com/yahoo/vespa/model/search/Tuning.java b/config-model/src/main/java/com/yahoo/vespa/model/search/Tuning.java
index 16b9680a0b2..a87a3d3e312 100644
--- a/config-model/src/main/java/com/yahoo/vespa/model/search/Tuning.java
+++ b/config-model/src/main/java/com/yahoo/vespa/model/search/Tuning.java
@@ -341,6 +341,8 @@ public class Tuning extends AbstractConfigProducer implements PartitionsConfig.P
             @Override
             public void getConfig(ProtonConfig.Builder builder) {
                 if (concurrency != null) {
+                    // We divide by 2 as this number is used for 2 different thread pools.
+                    // Not perfect, but the best way to split the resources evenly.
                     builder.feeding.concurrency(concurrency/2);
                 }
             }