netdev - Re: [PATCH] net_sched: factorize qdisc stats handling

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Date:	Mon, 17 Jan 2011 22:55:23 +0100 (CET)
From:	Jesper Dangaard Brouer <hawk@...u.dk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Changli Gao <xiaosuo@...il.com>,
	David Miller <davem@...emloft.net>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	netdev <netdev@...r.kernel.org>,
	Luigi Rizzo <rizzo@....unipi.it>, hawk@...x.dk
Subject: Re: [PATCH] net_sched: factorize qdisc stats handling



On Sat, 8 Jan 2011, Eric Dumazet wrote:
>> Changli Gao <xiaosuo@...il.com> wrote:
>>
>>>> +       cl->bstats.packets += skb_is_gso(skb)?skb_shinfo(skb)->gso_segs:1;

What about the qlen when we enqueue a GSO packet? Should we account for 
the number of internal GSO packets, or just account a GSO packet as a 
single packet?

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 0918834..1a8c0a3 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -453,7 +453,8 @@ static int pfifo_fast_enqueue(struct sk_buff *skb, 
struct Qdisc* qdisc)
                 struct sk_buff_head *list = band2list(priv, band);

                 priv->bitmap |= (1 << band);
-               qdisc->q.qlen++;
+               /* Should the number of GSO packets be taken into account?*/
+               qdisc->q.qlen += skb_is_gso(skb)?skb_shinfo(skb)->gso_segs:1;
                 return __qdisc_enqueue_tail(skb, qdisc, list);
         }

Is is at all legal to modify the q.qlen this way?

Cheers
   Jesper Brouer

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Dept. of Computer Science, University of Copenhagen
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