netdev - Re: [PATCH net-next] net_sched: increase drops and decrease backlog when packets are dropped

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Message-ID: <1399384701.15399.4.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 06 May 2014 06:58:21 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	netdev@...r.kernel.org, vtlam@...gle.com, nanditad@...gle.com,
	davem@...emloft.net
Subject: Re: [PATCH net-next] net_sched: increase drops and decrease backlog
 when packets are dropped

On Tue, 2014-05-06 at 17:37 +0800, Yang Yingliang wrote:
> When packets are dropped, backlog and drops statistic of qdisc
> need be changed. Replace kfree_skb() with qdisc_drop() for
> increasing drops.
> 
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---


> diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
> index 0bf432c782c1..83abd4cd10cd 100644
> --- a/net/sched/sch_fq_codel.c
> +++ b/net/sched/sch_fq_codel.c
> @@ -344,7 +344,8 @@ static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt)
>  	while (sch->q.qlen > sch->limit) {
>  		struct sk_buff *skb = fq_codel_dequeue(sch);
>  
> -		kfree_skb(skb);
> +		sch->qstats.backlog -= qdisc_pkt_len(skb);

Hmmm... please describe how you tested this change ?

> +		qdisc_drop(skb, sch);
>  		q->cstats.drop_count++;
>  	}
>  	qdisc_tree_decrease_qlen(sch, q->cstats.drop_count);


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