From: Cong Wang <cwang@twopensource.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>,
netdev <netdev@vger.kernel.org>,
Jamal Hadi Salim <jhs@mojatatu.com>
Subject: Re: [Patch net-next v2 2/4] net_sched: update hierarchical backlog too
Date: Mon, 2 Nov 2015 13:09:30 -0800 [thread overview]
Message-ID: <CAHA+R7NkU3Bme5MbgFraOo=7SRYUF+F-6owyzFxfVidjc2AxMw@mail.gmail.com> (raw)
In-Reply-To: <1446233450.6254.29.camel@edumazet-glaptop2.roam.corp.google.com>
(Sorry for the delay)
On Fri, Oct 30, 2015 at 12:30 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Fri, 2015-10-30 at 11:22 -0700, Cong Wang wrote:
>> diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
>> index 3abab53..498f0a2 100644
>> --- a/net/sched/sch_sfq.c
>> +++ b/net/sched/sch_sfq.c
>> @@ -346,7 +346,7 @@ static int
>> sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
>> {
>> struct sfq_sched_data *q = qdisc_priv(sch);
>> - unsigned int hash;
>> + unsigned int hash, dropped;
>> sfq_index x, qlen;
>> struct sfq_slot *slot;
>> int uninitialized_var(ret);
>> @@ -461,7 +461,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
>> return NET_XMIT_SUCCESS;
>>
>> qlen = slot->qlen;
>> - sfq_drop(sch);
>> + dropped = sfq_drop(sch);
>> /* Return Congestion Notification only if we dropped a packet
>> * from this flow.
>> */
>> @@ -469,7 +469,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
>> return NET_XMIT_CN;
>
>
> I believe you missed the NET_XMIT_CN cases.
>
> SFQ can drop a prior packet, and queue current packet.
>
> qdisc_tree_reduce_backlog() wont be called to update parents.
>
> Not sure about other qdisc(s)
Are you saying some qdisc_tree_reduce_backlog() is missing? It could be,
since I don't audit that, if so, I'd do that in a separated patch, because this
patch is supposed to fix existing qdisc_tree_reduce_backlog().
Does this make sense for you?
Thanks.
next prev parent reply other threads:[~2015-11-02 21:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-30 18:22 [Patch net-next v2 0/4] net_sched: update backlog for hierarchical qdisc's Cong Wang
2015-10-30 18:22 ` [Patch net-next v2 1/4] net_sched: introduce qdisc_replace() helper Cong Wang
2015-10-30 18:22 ` [Patch net-next v2 2/4] net_sched: update hierarchical backlog too Cong Wang
2015-10-30 19:30 ` Eric Dumazet
2015-11-02 21:09 ` Cong Wang [this message]
2015-11-02 21:20 ` Eric Dumazet
2015-11-02 21:50 ` Cong Wang
2015-10-30 18:22 ` [Patch net-next v2 3/4] sch_htb: update backlog as well Cong Wang
2015-10-30 18:22 ` [Patch net-next v2 4/4] sch_dsmark: " Cong Wang
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