netdev - Re: [RFC] sched: CHOKe packet scheduler

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Message-ID: <1294208375.3420.46.camel@edumazet-laptop>
Date:	Wed, 05 Jan 2011 07:19:35 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC] sched: CHOKe packet scheduler

Le mardi 04 janvier 2011 à 16:29 -0800, Stephen Hemminger a écrit :
> +static struct sk_buff *skb_peek_random(struct sk_buff_head *list)
> +{
> +	struct sk_buff *skb = list->next;
> +	unsigned int idx = net_random() % list->qlen;
> +
> +	while (skb && idx-- > 0)
> +		skb = skb->next;
> +
> +	return skb;
> +}

You could avoid the divide op :

unsigned int idx = reciprocal_divide(random32(), list->qlen);



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