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pkt_sched: HTB scheduler, change default hysteresis mode to off.

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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@comx.dk>
Acked-by: Martin Devera <devik@cdi.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2008-06-16 16:38:33 -07:00 committed by David S. Miller
parent 34a5d71305
commit f9ffcedddb
1 changed files with 1 additions and 1 deletions
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2
net/sched/sch_htb.c
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@ -53,7 +53,7 @@
*/ */
#define HTB_HSIZE 16 /* classid hash size */ #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 */ #define HTB_VER 0x30011 /* major must be matched with number suplied by TC as version */
#if HTB_VER >> 16 != TC_HTB_PROTOVER #if HTB_VER >> 16 != TC_HTB_PROTOVER