From bdc450a0bb1d48144ced1f899cc8366ec8e85024 Mon Sep 17 00:00:00 2001 From: Thomas Graf Date: Sat, 5 Nov 2005 21:14:28 +0100 Subject: [PKT_SCHED]: (G)RED: Introduce hard dropping Introduces a new flag TC_RED_HARDDROP which specifies that if ECN marking is enabled packets should still be dropped once the average queue length exceeds the maximum threshold. This _may_ help to avoid global synchronisation during small bursts of peers advertising but not caring about ECN. Use this option very carefully, it does more harm than good if (qth_max - qth_min) does not cover at least two average burst cycles. The difference to the current behaviour, in which we'd run into the hard queue limit, is that due to the low pass filter of RED short bursts are less likely to cause a global synchronisation. Signed-off-by: Thomas Graf Signed-off-by: Arnaldo Carvalho de Melo --- include/linux/pkt_sched.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/pkt_sched.h') diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h index 0ebe320223e2..e87b233615b3 100644 --- a/include/linux/pkt_sched.h +++ b/include/linux/pkt_sched.h @@ -93,6 +93,7 @@ struct tc_fifo_qopt /* PRIO section */ #define TCQ_PRIO_BANDS 16 +#define TCQ_MIN_PRIO_BANDS 2 struct tc_prio_qopt { @@ -169,6 +170,7 @@ struct tc_red_qopt unsigned char Scell_log; /* cell size for idle damping */ unsigned char flags; #define TC_RED_ECN 1 +#define TC_RED_HARDDROP 2 }; struct tc_red_xstats -- cgit v1.2.3