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authorEric Dumazet <edumazet@google.com>2018-11-19 17:30:19 -0800
committerDavid S. Miller <davem@davemloft.net>2018-11-20 09:51:32 -0800
commit6b015a523fa3ba57ccd9c72697163b560fcdedb4 (patch)
tree531594a49b69a9843804d30d7e1f2cd4adb53bf7 /net
parent6133e78f4102405b1505b749d3bd06564ddafea9 (diff)
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 <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/sch_fq.c7
1 files changed, 6 insertions, 1 deletions
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;