mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-23 14:59:54 +02:00
07d80167c0
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33560 3c298f89-4303-0410-b956-a3cf2f4a3e73
133 lines
4.5 KiB
Diff
133 lines
4.5 KiB
Diff
From 7bd90773f89001ea4960ed47676b550137f3facb Mon Sep 17 00:00:00 2001
|
|
From: Eric Dumazet <edumazet@google.com>
|
|
Date: Wed, 16 May 2012 04:39:09 +0000
|
|
Subject: [PATCH] fq_codel: should use qdisc backlog as threshold
|
|
|
|
commit 865ec5523dadbedefbc5710a68969f686a28d928 upstream.
|
|
|
|
codel_should_drop() logic allows a packet being not dropped if queue
|
|
size is under max packet size.
|
|
|
|
In fq_codel, we have two possible backlogs : The qdisc global one, and
|
|
the flow local one.
|
|
|
|
The meaningful one for codel_should_drop() should be the global backlog,
|
|
not the per flow one, so that thin flows can have a non zero drop/mark
|
|
probability.
|
|
|
|
Signed-off-by: Eric Dumazet <edumazet@google.com>
|
|
Cc: Dave Taht <dave.taht@bufferbloat.net>
|
|
Cc: Kathleen Nichols <nichols@pollere.com>
|
|
Cc: Van Jacobson <van@pollere.net>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
include/net/codel.h | 15 +++++++--------
|
|
net/sched/sch_codel.c | 4 ++--
|
|
net/sched/sch_fq_codel.c | 5 +++--
|
|
3 files changed, 12 insertions(+), 12 deletions(-)
|
|
|
|
--- a/include/net/codel.h
|
|
+++ b/include/net/codel.h
|
|
@@ -205,7 +205,7 @@ static codel_time_t codel_control_law(co
|
|
|
|
|
|
static bool codel_should_drop(const struct sk_buff *skb,
|
|
- unsigned int *backlog,
|
|
+ struct Qdisc *sch,
|
|
struct codel_vars *vars,
|
|
struct codel_params *params,
|
|
struct codel_stats *stats,
|
|
@@ -219,13 +219,13 @@ static bool codel_should_drop(const stru
|
|
}
|
|
|
|
vars->ldelay = now - codel_get_enqueue_time(skb);
|
|
- *backlog -= qdisc_pkt_len(skb);
|
|
+ sch->qstats.backlog -= qdisc_pkt_len(skb);
|
|
|
|
if (unlikely(qdisc_pkt_len(skb) > stats->maxpacket))
|
|
stats->maxpacket = qdisc_pkt_len(skb);
|
|
|
|
if (codel_time_before(vars->ldelay, params->target) ||
|
|
- *backlog <= stats->maxpacket) {
|
|
+ sch->qstats.backlog <= stats->maxpacket) {
|
|
/* went below - stay below for at least interval */
|
|
vars->first_above_time = 0;
|
|
return false;
|
|
@@ -249,8 +249,7 @@ static struct sk_buff *codel_dequeue(str
|
|
struct codel_params *params,
|
|
struct codel_vars *vars,
|
|
struct codel_stats *stats,
|
|
- codel_skb_dequeue_t dequeue_func,
|
|
- u32 *backlog)
|
|
+ codel_skb_dequeue_t dequeue_func)
|
|
{
|
|
struct sk_buff *skb = dequeue_func(vars, sch);
|
|
codel_time_t now;
|
|
@@ -261,7 +260,7 @@ static struct sk_buff *codel_dequeue(str
|
|
return skb;
|
|
}
|
|
now = codel_get_time();
|
|
- drop = codel_should_drop(skb, backlog, vars, params, stats, now);
|
|
+ drop = codel_should_drop(skb, sch, vars, params, stats, now);
|
|
if (vars->dropping) {
|
|
if (!drop) {
|
|
/* sojourn time below target - leave dropping state */
|
|
@@ -292,7 +291,7 @@ static struct sk_buff *codel_dequeue(str
|
|
qdisc_drop(skb, sch);
|
|
stats->drop_count++;
|
|
skb = dequeue_func(vars, sch);
|
|
- if (!codel_should_drop(skb, backlog,
|
|
+ if (!codel_should_drop(skb, sch,
|
|
vars, params, stats, now)) {
|
|
/* leave dropping state */
|
|
vars->dropping = false;
|
|
@@ -313,7 +312,7 @@ static struct sk_buff *codel_dequeue(str
|
|
stats->drop_count++;
|
|
|
|
skb = dequeue_func(vars, sch);
|
|
- drop = codel_should_drop(skb, backlog, vars, params,
|
|
+ drop = codel_should_drop(skb, sch, vars, params,
|
|
stats, now);
|
|
}
|
|
vars->dropping = true;
|
|
--- a/net/sched/sch_codel.c
|
|
+++ b/net/sched/sch_codel.c
|
|
@@ -77,8 +77,8 @@ static struct sk_buff *codel_qdisc_deque
|
|
struct codel_sched_data *q = qdisc_priv(sch);
|
|
struct sk_buff *skb;
|
|
|
|
- skb = codel_dequeue(sch, &q->params, &q->vars, &q->stats,
|
|
- dequeue, &sch->qstats.backlog);
|
|
+ skb = codel_dequeue(sch, &q->params, &q->vars, &q->stats, dequeue);
|
|
+
|
|
/* We cant call qdisc_tree_decrease_qlen() if our qlen is 0,
|
|
* or HTB crashes. Defer it for next round.
|
|
*/
|
|
--- a/net/sched/sch_fq_codel.c
|
|
+++ b/net/sched/sch_fq_codel.c
|
|
@@ -217,13 +217,14 @@ static int fq_codel_enqueue(struct sk_bu
|
|
*/
|
|
static struct sk_buff *dequeue(struct codel_vars *vars, struct Qdisc *sch)
|
|
{
|
|
+ struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
struct fq_codel_flow *flow;
|
|
struct sk_buff *skb = NULL;
|
|
|
|
flow = container_of(vars, struct fq_codel_flow, cvars);
|
|
if (flow->head) {
|
|
skb = dequeue_head(flow);
|
|
- sch->qstats.backlog -= qdisc_pkt_len(skb);
|
|
+ q->backlogs[flow - q->flows] -= qdisc_pkt_len(skb);
|
|
sch->q.qlen--;
|
|
}
|
|
return skb;
|
|
@@ -256,7 +257,7 @@ begin:
|
|
prev_ecn_mark = q->cstats.ecn_mark;
|
|
|
|
skb = codel_dequeue(sch, &q->cparams, &flow->cvars, &q->cstats,
|
|
- dequeue, &q->backlogs[flow - q->flows]);
|
|
+ dequeue);
|
|
|
|
flow->dropped += q->cstats.drop_count - prev_drop_count;
|
|
flow->dropped += q->cstats.ecn_mark - prev_ecn_mark;
|