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From bc9fec2f87d57bdbff30d296605e24504513f65c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dave=20T=C3=A4ht?= <dave.taht@bufferbloat.net>
Date: Mon, 17 Sep 2012 19:20:22 -0700
Subject: [PATCH 4/7] net: add skb_reduce_truesize support to common qdiscs
Reduce skb size under load when queues begin to fill on the
commont qdiscs.
---
net/sched/sch_codel.c | 2 ++
net/sched/sch_fifo.c | 12 ++++++++----
net/sched/sch_fq_codel.c | 2 ++
3 files changed, 12 insertions(+), 4 deletions(-)
--- a/net/sched/sch_codel.c
+++ b/net/sched/sch_codel.c
@@ -96,6 +96,8 @@ static int codel_qdisc_enqueue(struct sk
struct codel_sched_data *q;
if (likely(qdisc_qlen(sch) < sch->limit)) {
+ if(qdisc_qlen(sch) > 128)
+ skb = skb_reduce_truesize(skb);
codel_set_enqueue_time(skb);
return qdisc_enqueue_tail(skb, sch);
}
--- a/net/sched/sch_fifo.c
+++ b/net/sched/sch_fifo.c
@@ -29,17 +29,21 @@ static int bfifo_enqueue(struct sk_buff
static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
- if (likely(skb_queue_len(&sch->q) < sch->limit))
+ if (likely(skb_queue_len(&sch->q) < sch->limit)) {
+ if (skb_queue_len(&sch->q) > 128)
+ skb = skb_reduce_truesize(skb);
return qdisc_enqueue_tail(skb, sch);
-
+ }
return qdisc_reshape_fail(skb, sch);
}
static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
- if (likely(skb_queue_len(&sch->q) < sch->limit))
+ if (likely(skb_queue_len(&sch->q) < sch->limit)) {
+ if (skb_queue_len(&sch->q) > 128)
+ skb = skb_reduce_truesize(skb);
return qdisc_enqueue_tail(skb, sch);
-
+ }
/* queue full, remove one skb to fulfill the limit */
__qdisc_queue_drop_head(sch, &sch->q);
sch->qstats.drops++;
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -182,6 +182,8 @@ static int fq_codel_enqueue(struct sk_bu
return ret;
}
idx--;
+ if (sch->q.qlen > 128)
+ skb = skb_reduce_truesize(skb);
codel_set_enqueue_time(skb);
flow = &q->flows[idx];
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