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

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Date:	Mon, 15 Jul 2013 11:12:22 -0700
From:	Joe Perches <joe@...ches.com>
To:	Paolo Valente <paolo.valente@...more.it>
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

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.

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