[Codel] [PATCH 2/2] codel: The missing fourth state

["Dave Täht" <dave.taht@bufferbloat.net>]

I'm not saying this is correct. But it would account for a quantum miss.

As for good queue vs bad queue... don't know.

In testing with 1 or 50 streams, at 100Mbit, it seems to do the job.

I look forward to reading the actual paper.
---
 net/sched/sch_codel.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/sched/sch_codel.c b/net/sched/sch_codel.c
index a9e6383..55c75de 100644
--- a/net/sched/sch_codel.c
+++ b/net/sched/sch_codel.c
@@ -195,9 +195,11 @@ static u32 count_rescale(struct codel_sched_data *q, codel_time_t now) {
 			default:
 				c = q->count - 1;
 		}
-		c = max(1U, c);
-	} 
-	return (u32) c;
+	} else {
+		c = q->count >> 4;
+		} 
+	  c = max(1U, c);
+	  return (u32) c;
 }
 
 static struct sk_buff *codel_dequeue(struct Qdisc *sch)
@@ -247,7 +249,7 @@ static struct sk_buff *codel_dequeue(struct Qdisc *sch)
 		}
 	} else if (drop &&
 		   (codel_time_before(now - q->drop_next,
-				      16 * q->interval) ||
+				     16 * q->interval) ||
 		    codel_time_after_eq(now - q->first_above_time,
 					2 * q->interval))) {
 		codel_drop(sch, skb);
-- 
1.7.9.5