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| author | Krishna Kumar <krkumar2@in.ibm.com> | 2009-08-30 22:20:28 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-08-30 22:20:28 -0700 |
| commit | a453e0689a3ccf85c08cb89753d7685046248c5c (patch) | |
| tree | a85542ee234e7b9fe4f6a4a1837d4a99139c7e73 | |
| parent | 03a9a447d2dab755b22df79b5e205fdbb9b2c851 (diff) | |
| download | linux-a453e0689a3ccf85c08cb89753d7685046248c5c.tar.bz2 | |
pkt_sched: Fix resource limiting in pfifo_fast
pfifo_fast_enqueue has this check:
if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) {
which allows each band to enqueue upto tx_queue_len skbs for a
total of 3*tx_queue_len skbs. I am not sure if this was the
intention of limiting in qdisc.
Patch compiled and 32 simultaneous netperf testing ran fine. Also:
# tc -s qdisc show dev eth2
qdisc pfifo_fast 0: root bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
Sent 16835026752 bytes 373116 pkt (dropped 0, overlimits 0 requeues 25)
rate 0bit 0pps backlog 0b 0p requeues 25
Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/sched/sch_generic.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 6f7aebd14072..6128e6f24589 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -432,11 +432,11 @@ static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv, static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) { - int band = prio2band[skb->priority & TC_PRIO_MAX]; - struct pfifo_fast_priv *priv = qdisc_priv(qdisc); - struct sk_buff_head *list = band2list(priv, band); + if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) { + int band = prio2band[skb->priority & TC_PRIO_MAX]; + struct pfifo_fast_priv *priv = qdisc_priv(qdisc); + struct sk_buff_head *list = band2list(priv, band); - if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) { priv->bitmap |= (1 << band); qdisc->q.qlen++; return __qdisc_enqueue_tail(skb, qdisc, list); |