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net/sched: sch_cake: avoid sync overhead when unlimited

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Skip inter-instance sync when no rate limit is configured, as it serves
no purpose and only adds overhead.

Fixes: 1bddd758ba ("net/sched: sch_cake: share shaper state across sub-instances of cake_mq")
Signed-off-by: Jonas Köppeler <j.koeppeler@tu-berlin.de>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260226-cake-mq-skip-sync-bandwidth-unlimited-v1-1-01830bb4db87@tu-berlin.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jonas Köppeler 2026-02-26 12:40:15 +01:00 • committed by Jakub Kicinski
parent 29252397bc
commit 0b3cd139be
1 changed files with 2 additions and 1 deletions
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3
net/sched/sch_cake.c
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@ -2013,7 +2013,8 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch)
u64 delay;
u32 len;
if (q->config->is_shared && now - q->last_checked_active >= q->config->sync_time) {
if (q->config->is_shared && q->rate_ns &&
now - q->last_checked_active >= q->config->sync_time) {
struct net_device *dev = qdisc_dev(sch);
struct cake_sched_data *other_priv;
u64 new_rate = q->config->rate_bps;