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authorEric Dumazet <edumazet@google.com>2016-06-21 23:16:49 -0700
committerDavid S. Miller <davem@davemloft.net>2016-06-25 12:19:35 -0400
commit520ac30f45519b0a82dd92117c181d1d6144677b (patch)
treea3189ae1ab3b5be6213716e42ddaec082578e774 /net/sched/sch_htb.c
parent36195d869e4b1dbf81bafa3a31bb095a3c013bdd (diff)
net_sched: drop packets after root qdisc lock is released
Qdisc performance suffers when packets are dropped at enqueue() time because drops (kfree_skb()) are done while qdisc lock is held, delaying a dequeue() draining the queue. Nominal throughput can be reduced by 50 % when this happens, at a time we would like the dequeue() to proceed as fast as possible. Even FQ is vulnerable to this problem, while one of FQ goals was to provide some flow isolation. This patch adds a 'struct sk_buff **to_free' parameter to all qdisc->enqueue(), and in qdisc_drop() helper. I measured a performance increase of up to 12 %, but this patch is a prereq so that future batches in enqueue() can fly. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_htb.c')
-rw-r--r--net/sched/sch_htb.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index a454605ab5cb..f3882259c385 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -569,7 +569,8 @@ static inline void htb_deactivate(struct htb_sched *q, struct htb_class *cl)
list_del_init(&cl->un.leaf.drop_list);
}
-static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
+ struct sk_buff **to_free)
{
int uninitialized_var(ret);
struct htb_sched *q = qdisc_priv(sch);
@@ -581,16 +582,17 @@ static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
__skb_queue_tail(&q->direct_queue, skb);
q->direct_pkts++;
} else {
- return qdisc_drop(skb, sch);
+ return qdisc_drop(skb, sch, to_free);
}
#ifdef CONFIG_NET_CLS_ACT
} else if (!cl) {
if (ret & __NET_XMIT_BYPASS)
qdisc_qstats_drop(sch);
- kfree_skb(skb);
+ __qdisc_drop(skb, to_free);
return ret;
#endif
- } else if ((ret = qdisc_enqueue(skb, cl->un.leaf.q)) != NET_XMIT_SUCCESS) {
+ } else if ((ret = qdisc_enqueue(skb, cl->un.leaf.q,
+ to_free)) != NET_XMIT_SUCCESS) {
if (net_xmit_drop_count(ret)) {
qdisc_qstats_drop(sch);
cl->qstats.drops++;