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net/sched: sch_cake: fix autorate reconfiguration throttling

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CAKE's autorate-ingress path intends to limit shaper reconfiguration to
once per 250 ms, but last_reconfig_time is only checked and never updated.
Since the field stays zero, every qualifying capacity-estimate window can
call cake_reconfigure(), causing avoidable rate churn and scheduler work
under bursty traffic.

Store the current timestamp when autorate actually reconfigures the qdisc
so the guard enforces the intended interval.

Fixes: 7298de9cd7 ("sch_cake: Add ingress mode")
Signed-off-by: Giuseppe Piscitelli <ooonea@gmail.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260820154503.892214-1-ooonea@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Giuseppe Piscitelli
2026-08-22 13:51:40 -07:00
committed by Jakub Kicinski
parent 11efd7963d
commit 7cbfb18094
1 changed files with 1 additions and 0 deletions
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net/sched/sch_cake.c
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@@ -1907,6 +1907,7 @@ static s32 cake_enqueue(struct sk_buff *skb, struct Qdisc *sch,
ktime_add_ms(q->last_reconfig_time,
250))) {
q->config->rate_bps = (q->avg_peak_bandwidth * 15) >> 4;
q->last_reconfig_time = now;
cake_reconfigure(sch);
}
}