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Date:	Fri, 23 Mar 2007 14:35:40 +0100 (MET)
From:	Patrick McHardy <>
Cc:, Patrick McHardy <>
Subject: [NET_SCHED 01/11]: sch_netem: fix off-by-one in send time comparison

[NET_SCHED]: sch_netem: fix off-by-one in send time comparison

netem checks PSCHED_TLESS(cb->time_to_send, now) to find out whether it is
allowed to send a packet, which is equivalent to cb->time_to_send < now.
Use !PSCHED_TLESS(now, cb->time_to_send) instead to properly handle
cb->time_to_send == now.

Signed-off-by: Patrick McHardy <>

commit 9f8c07452088f432c79ac3a8d87d6adebcce57df
tree 42b214f74b8b2d5bd3065e9f63d8048beb4f3bdc
parent 3231f075945001667eafaf325abab8c992b3d1e4
author Patrick McHardy <> Thu, 22 Mar 2007 23:57:32 +0100
committer Patrick McHardy <> Fri, 23 Mar 2007 10:31:26 +0100

 net/sched/sch_netem.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 3e1b633..bc42843 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -286,7 +286,7 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
 		/* if more time remaining? */
-		if (PSCHED_TLESS(cb->time_to_send, now)) {
+		if (!PSCHED_TLESS(now, cb->time_to_send)) {
 			pr_debug("netem_dequeue: return skb=%p\n", skb);
 			return skb;
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