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kernel: don't scrimp on memory on big iron

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x86_64 platforms typically don't lack memory, so don't needlessly
economize memory if fq_codel on capable platforms.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
[Add a comment to the patch]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Philip Prindeville
2017-09-19 17:49:13 -06:00
committed by Hauke Mehrtens
parent 82739648c0
commit f138833d0c
2 changed files with 10 additions and 4 deletions
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10
target/linux/generic/hack-4.9/660-fq_codel_defaults.patch
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@@ -3,6 +3,9 @@ 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 +-
@@ -10,12 +13,15 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -479,7 +479,7 @@ static int fq_codel_init(struct Qdisc *s
@@ -479,7 +479,11 @@ static int fq_codel_init(struct Qdisc *s
sch->limit = 10*1024;
q->flows_cnt = 1024;
- q->memory_limit = 32 << 20; /* 32 MBytes */
+#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));
q->perturbation = prandom_u32();