From 6b015a523fa3ba57ccd9c72697163b560fcdedb4 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 19 Nov 2018 17:30:19 -0800 Subject: net_sched: sch_fq: avoid calling ktime_get_ns() if not needed There are two cases were we can avoid calling ktime_get_ns() : 1) Queue is empty. 2) Internal queue is not empty. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/sched/sch_fq.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'net/sched') diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c index 1da8864502d4..1a662f2bb7bb 100644 --- a/net/sched/sch_fq.c +++ b/net/sched/sch_fq.c @@ -414,16 +414,21 @@ static void fq_check_throttled(struct fq_sched_data *q, u64 now) static struct sk_buff *fq_dequeue(struct Qdisc *sch) { struct fq_sched_data *q = qdisc_priv(sch); - u64 now = ktime_get_ns(); struct fq_flow_head *head; struct sk_buff *skb; struct fq_flow *f; unsigned long rate; u32 plen; + u64 now; + + if (!sch->q.qlen) + return NULL; skb = fq_dequeue_head(sch, &q->internal); if (skb) goto out; + + now = ktime_get_ns(); fq_check_throttled(q, now); begin: head = &q->new_flows; -- cgit v1.2.3