Commit f9ffcedd authored Jun 16, 2008 by Jesper Dangaard Brouer Committed by David S. Miller Jun 16, 2008

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 <hawk@comx.dk>
Acked-by: Martin Devera <devik@cdi.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 34a5d713

net/sched/sch_htb.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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