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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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);



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html