d19e522ec7
This patch enables for the configuration of the sync_time parameter. The value of the sync_time needs to be specified in nanoseconds. The default value is 200us (200 000 ns). This is especially helpful to get feedback from users about suitable values. Once a solid solution is found this patch can be removed. Signed-off-by: Jonas Köppeler <j.koeppeler@tu-berlin.de> Link: https://github.com/openwrt/openwrt/pull/22380 [Add patch to kernel 6.18 too] Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
69 lines
2.2 KiB
Diff
69 lines
2.2 KiB
Diff
From 4eb720d360d3fc227eedbc76993719e1906c418c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jonas=20K=C3=B6ppeler?= <j.koeppeler@tu-berlin.de>
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Date: Wed, 11 Mar 2026 17:42:44 +0100
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Subject: [PATCH] net/sched: sch_cake: configure sync_time via debugfs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Add a debugfs entry for sync_time to allow runtime adjustment of its
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value without recompilation. sync_time is specified in nanoseconds;
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setting it to 0 triggers synchronization on every packet.
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Signed-off-by: Jonas Köppeler <j.koeppeler@tu-berlin.de>
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---
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net/sched/sch_cake.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletion(-)
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--- a/net/sched/sch_cake.c
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+++ b/net/sched/sch_cake.c
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@@ -71,6 +71,7 @@
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#include <net/pkt_cls.h>
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#include <net/tcp.h>
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#include <net/flow_dissector.h>
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+#include <linux/debugfs.h>
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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#include <net/netfilter/nf_conntrack_core.h>
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@@ -81,6 +82,8 @@
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#define CAKE_QUEUES (1024)
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#define CAKE_FLOW_MASK 63
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#define CAKE_FLOW_NAT_FLAG 64
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+static u64 g_sync_time_ns = 200*NSEC_PER_USEC;
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+static struct dentry *cake_mq_debugfs;
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/* struct cobalt_params - contains codel and blue parameters
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* @interval: codel initial drop rate
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@@ -2019,7 +2022,7 @@ static struct sk_buff *cake_dequeue(stru
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u32 len;
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if (q->config->is_shared && q->rate_ns &&
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- now - q->last_checked_active >= q->config->sync_time) {
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+ now - q->last_checked_active >= g_sync_time_ns) {
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struct net_device *dev = qdisc_dev(sch);
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struct cake_sched_data *other_priv;
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u64 new_rate = q->config->rate_bps;
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@@ -3358,8 +3361,13 @@ static int __init cake_module_init(void)
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return ret;
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ret = register_qdisc(&cake_mq_qdisc_ops);
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- if (ret)
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+ if (ret) {
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unregister_qdisc(&cake_qdisc_ops);
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+ } else {
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+ struct dentry *cake_mq_debugfs = debugfs_create_dir("cake_mq", NULL);
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+
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+ debugfs_create_u64("sync_time_ns", 0644, cake_mq_debugfs, &g_sync_time_ns);
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+ }
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return ret;
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}
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@@ -3368,6 +3376,7 @@ static void __exit cake_module_exit(void
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{
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unregister_qdisc(&cake_qdisc_ops);
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unregister_qdisc(&cake_mq_qdisc_ops);
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+ debugfs_remove_recursive(cake_mq_debugfs);
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}
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module_init(cake_module_init)
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