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authorJesper Dangaard Brouer <hawk@comx.dk>2008-06-16 16:38:33 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-16 16:38:33 -0700
commitf9ffcedddba5b2fc5ab16ef08bca55af8be2717e (patch)
treedc51b00085b8db2863c4191ea8b1d5623057c11a
parent34a5d713056c325e5bf2b5361646585d5f550a72 (diff)
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>
-rw-r--r--net/sched/sch_htb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 5bc1ed49018..9134f029ee0 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