AcoSail/kernel_optimize_test
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net_sched: sfb: optimize enqueue on full queue

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In case SFB queue is full (hard limit reached), there is no point
spending time to compute hash and maximum qlen/p_mark.

We instead just early drop packet.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-08-25 06:21:32 +00:00 committed by David S. Miller
parent 18cf1248ec
commit 363437f40a
1 changed files with 8 additions and 5 deletions
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13
net/sched/sch_sfb.c
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@ -287,6 +287,12 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
u32 r, slot, salt, sfbhash;
int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
if (unlikely(sch->q.qlen >= q->limit)) {
sch->qstats.overlimits++;
q->stats.queuedrop++;
goto drop;
}
if (q->rehash_interval > 0) {
unsigned long limit = q->rehash_time + q->rehash_interval;
@ -332,12 +338,9 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
slot ^= 1;
sfb_skb_cb(skb)->hashes[slot] = 0;
if (unlikely(minqlen >= q->max || sch->q.qlen >= q->limit)) {
if (unlikely(minqlen >= q->max)) {
sch->qstats.overlimits++;
if (minqlen >= q->max)
q->stats.bucketdrop++;
else
q->stats.queuedrop++;
q->stats.bucketdrop++;
goto drop;
}