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authorEric Dumazet <eric.dumazet@gmail.com>2011-01-20 23:31:33 -0800
committerDavid S. Miller <davem@davemloft.net>2011-01-20 23:31:33 -0800
commit9190b3b3208d052d98cb601fcc192f3f71a5658b (patch)
treeb642a00320a1b35e33741fcd162072724f228fbf /net/sched/sch_cbq.c
parentb30532515f0a62bfe17207ab00883dd262497006 (diff)
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net_sched: accurate bytes/packets stats/rates
In commit 44b8288308ac9d (net_sched: pfifo_head_drop problem), we fixed a problem with pfifo_head drops that incorrectly decreased sch->bstats.bytes and sch->bstats.packets Several qdiscs (CHOKe, SFQ, pfifo_head, ...) are able to drop a previously enqueued packet, and bstats cannot be changed, so bstats/rates are not accurate (over estimated) This patch changes the qdisc_bstats updates to be done at dequeue() time instead of enqueue() time. bstats counters no longer account for dropped frames, and rates are more correct, since enqueue() bursts dont have effect on dequeue() rate. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_cbq.c')
-rw-r--r--net/sched/sch_cbq.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index c80d1c210c5d..5f63ec58942c 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -390,7 +390,6 @@ cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
ret = qdisc_enqueue(skb, cl->q);
if (ret == NET_XMIT_SUCCESS) {
sch->q.qlen++;
- qdisc_bstats_update(sch, skb);
cbq_mark_toplevel(q, cl);
if (!cl->next_alive)
cbq_activate_class(cl);
@@ -649,7 +648,6 @@ static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child)
ret = qdisc_enqueue(skb, cl->q);
if (ret == NET_XMIT_SUCCESS) {
sch->q.qlen++;
- qdisc_bstats_update(sch, skb);
if (!cl->next_alive)
cbq_activate_class(cl);
return 0;
@@ -971,6 +969,7 @@ cbq_dequeue(struct Qdisc *sch)
skb = cbq_dequeue_1(sch);
if (skb) {
+ qdisc_bstats_update(sch, skb);
sch->q.qlen--;
sch->flags &= ~TCQ_F_THROTTLED;
return skb;