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Message-Id: <1212501907.13164.30.camel@localhost.localdomain> Date: Tue, 03 Jun 2008 16:05:07 +0200 From: Jesper Dangaard Brouer <jdb@...x.dk> To: "David S. Miller" <davem@...emloft.net> Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Martin Devera <devik@....cz> Subject: [PATCH 1/2] 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 <hawk@...x.dk> --- net/sched/sch_htb.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 5bc1ed4..9134f02 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 -- 1.5.4.2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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