openwrt/target/linux/generic/hack-4.9/660-fq_codel_defaults.patch

From a6ccb238939b25851474a279b20367fd24a0e816 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 7 Jul 2017 17:21:53 +0200
Subject:  hack: net: fq_codel: tune defaults for small devices

Assume that x86_64 devices always have a big memory and do not need this 
optimization compared to devices with only 32 MB or 64 MB RAM.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/sched/sch_fq_codel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -485,7 +485,11 @@ static int fq_codel_init(struct Qdisc *s
 
 	sch->limit = 10*1024;
 	q->flows_cnt = 1024;
+#ifdef CONFIG_X86_64
 	q->memory_limit = 32 << 20; /* 32 MBytes */
+#else
+	q->memory_limit = 4 << 20; /* 4 MBytes */
+#endif
 	q->drop_batch_size = 64;
 	q->quantum = psched_mtu(qdisc_dev(sch));
 	get_random_bytes(&q->perturbation, sizeof(q->perturbation));