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

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Date:	Wed, 07 May 2014 19:55:01 -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 Thu, 2014-05-08 at 10:08 +0800, Yang Yingliang wrote:
> On 2014/5/6 21:58, Eric Dumazet wrote:
> > 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 ?
> 
> Compiled only. The packet is dropped, so I think the backlog should be decreased.

Well, please test your patches then, and read again the code,
because you add a bug here.

Thanks.


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