From: Eric Dumazet <edumazet@google.com>
Date: Tue, 12 May 2026 09:48:59 +0000 (+0000)
Subject: net/sched: fq_codel: local packets no longer count against memory limit
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=150061a20651;p=thirdparty%2Fkernel%2Flinux.git

net/sched: fq_codel: local packets no longer count against memory limit

Commit 95b58430abe7 ("fq_codel: add memory limitation per queue")
claimed that the 32Mb default was "reasonable even for heavy duty usages."

In practice, this is not the case.

Packets that are associated with local sockets sk_wmem_alloc
do not really need additional memory control.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260512094859.3673997-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 1b1de693d4c6..71107dc52be7 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -212,7 +212,7 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 		q->new_flow_count++;
 		WRITE_ONCE(flow->deficit, q->quantum);
 	}
-	get_codel_cb(skb)->mem_usage = skb->truesize;
+	get_codel_cb(skb)->mem_usage = is_skb_wmem(skb) ? 0 : skb->truesize;
 	q->memory_usage += get_codel_cb(skb)->mem_usage;
 	memory_limited = q->memory_usage > q->memory_limit;
 	qdisc_qlen_inc(sch);