diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-06-11 02:41:39 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-06-11 09:58:21 +0300 |
| commit | 45f50bed1d808794e514e9eed0e579a8756ce2ba (patch) | |
| tree | 05d9f30419d6a5ef9b503487661959ef29c2fec5 /net/sched/sch_netem.c | |
| parent | 42117927cab5a13192ecc227bea19da5059ffc6c (diff) | |
| download | linux-45f50bed1d808794e514e9eed0e579a8756ce2ba.tar.xz | |
net_sched: remove generic throttled management
__QDISC_STATE_THROTTLED bit manipulation is rather expensive
for HTB and few others.
I already removed it for sch_fq in commit f2600cf02b5b
("net: sched: avoid costly atomic operation in fq_dequeue()")
and so far nobody complained.
When one ore more packets are stuck in one or more throttled
HTB class, a htb dequeue() performs two atomic operations
to clear/set __QDISC_STATE_THROTTLED bit, while root qdisc
lock is held.
Removing this pair of atomic operations bring me a 8 % performance
increase on 200 TCP_RR tests, in presence of throttled classes.
This patch has no side effect, since nothing actually uses
disc_is_throttled() anymore.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_netem.c')
| -rw-r--r-- | net/sched/sch_netem.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 2dbe732ca135..876df13c745a 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -587,7 +587,6 @@ tfifo_dequeue: if (skb) { qdisc_qstats_backlog_dec(sch, skb); deliver: - qdisc_unthrottled(sch); qdisc_bstats_update(sch, skb); return skb; } |