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Date:   Mon, 25 Feb 2019 22:42:17 -0800
From:   Eric Dumazet <>
To:     John Fastabend <>,
        Networking <>,
        Jamal Hadi Salim <>,
        Cong Wang <>,
        Jiri Pirko <>
Subject: [BUG] net/sched : qlen can not really be per cpu ?

HTB + pfifo_fast as a leaf qdisc hits badly the following warning in htb_activate() :

WARN_ON(cl->level || !cl->leaf.q || !cl->leaf.q->q.qlen);

This is because pfifo_fast does not update sch->q.qlen, but per cpu counters.
So cl->leaf.q->q.qlen is zero.

HFSC, CBQ, DRR, QFQ  have the same problem.

Any ideas how we can fix this ?

Thanks !

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