From e3ab23f20275f81471b7536b874df936e7df78ab Mon Sep 17 00:00:00 2001 From: nbd Date: Wed, 10 Apr 2013 13:11:16 +0000 Subject: =?UTF-8?q?kernel:=20add=20patches=20by=20Dave=20T=C3=A4ht=20to=20?= =?UTF-8?q?reduce=20buffer=20size=20in=20longer=20queues=20to=20reduce=20m?= =?UTF-8?q?emory=20pressure?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Felix Fietkau git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36301 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../patches-3.8/657-qdisc_reduce_truesize.patch | 63 ++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 target/linux/generic/patches-3.8/657-qdisc_reduce_truesize.patch (limited to 'target/linux/generic/patches-3.8/657-qdisc_reduce_truesize.patch') diff --git a/target/linux/generic/patches-3.8/657-qdisc_reduce_truesize.patch b/target/linux/generic/patches-3.8/657-qdisc_reduce_truesize.patch new file mode 100644 index 000000000..e27d0a04d --- /dev/null +++ b/target/linux/generic/patches-3.8/657-qdisc_reduce_truesize.patch @@ -0,0 +1,63 @@ +From bc9fec2f87d57bdbff30d296605e24504513f65c Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Dave=20T=C3=A4ht?= +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]; -- cgit v1.2.3