linux-kernel - Re: [PATCH BUGFIX] pkt_sched: sch_qfq: remove a source of high packet delay/jitter

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Message-ID: <51E4EC51.6000607@unimore.it>
Date:	Tue, 16 Jul 2013 08:46:41 +0200
From:	Paolo Valente <paolo.valente@...more.it>
To:	Joe Perches <joe@...ches.com>
CC:	Jamal Hadi Salim <jhs@...atatu.com>,
	"David S. Miller" <davem@...emloft.net>, shemminger@...tta.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	fchecconi@...il.com, rizzo@....unipi.it
Subject: Re: [PATCH BUGFIX] pkt_sched: sch_qfq: remove a source of high packet
 delay/jitter

Il 15/07/2013 20:12, Joe Perches ha scritto:
> On Mon, 2013-07-15 at 20:01 +0200, Paolo Valente wrote:
>> QFQ+ inherits from QFQ a design choice that may cause a high packet
>> delay/jitter and a severe short-term unfairness.
> []
>> diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
> []
>> @@ -189,6 +188,7 @@ struct qfq_sched {
>>   	struct qfq_aggregate	*in_serv_agg;   /* Aggregate being served. */
>>   	u32			num_active_agg; /* Num. of active aggregates */
>>   	u32			wsum;		/* weight sum */
>> +	unsigned long		iwsum;		/* inverse weight sum*/
>
> This is a different size for 32/64 bit compiles
> and may be better as u32.
>
>
Sending a new version with u32, thanks.
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