From: Jesper Dangaard Brouer Date: Mon, 16 Jun 2008 23:38:33 +0000 (-0700) Subject: pkt_sched: HTB scheduler, change default hysteresis mode to off. X-Git-Tag: v2.6.26-rc7~20^2~24 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9ffcedddba5b2fc5ab16ef08bca55af8be2717e;p=linux-2.6 pkt_sched: HTB scheduler, change default hysteresis mode to off. The HTB hysteresis mode reduce the CPU load, but at the cost of scheduling accuracy. On ADSL links (512 kbit/s upstream), this inaccuracy introduce significant jitter, enought to disturbe VoIP. For details see my masters thesis (http://www.adsl-optimizer.dk/thesis/), chapter 7, section 7.3.1, pp 69-70. Signed-off-by: Jesper Dangaard Brouer Acked-by: Martin Devera Signed-off-by: David S. Miller --- diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 5bc1ed4901..9134f029ee 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -53,7 +53,7 @@ */ #define HTB_HSIZE 16 /* classid hash size */ -#define HTB_HYSTERESIS 1 /* whether to use mode hysteresis for speedup */ +#define HTB_HYSTERESIS 0 /* whether to use mode hysteresis for speedup */ #define HTB_VER 0x30011 /* major must be matched with number suplied by TC as version */ #if HTB_VER >> 16 != TC_HTB_PROTOVER