netdev - Re: [PATCH] bonding: start slaves with link down for ARP monitor

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:	Sat, 14 Apr 2012 21:09:29 +0200
From:	Michal Kubecek <mkubecek@...e.cz>
To:	Flavio Leitner <fbl@...hat.com>
Cc:	netdev@...r.kernel.org, Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH] bonding: start slaves with link down for ARP monitor

On Sat, Apr 14, 2012 at 01:53:19AM -0300, Flavio Leitner wrote:
> On Thu, 12 Apr 2012 20:38:09 +0200
> Michal Kubecek <mkubecek@...e.cz> wrote:
> >  	new_slave->last_arp_rx = jiffies;
> > +	if (bond->params.arp_interval)
> > +		new_slave->last_arp_rx -=
> > +			(msecs_to_jiffies(bond->params.arp_interval) + 1);
> 
> 
> I don't see the point of checking bond->params.arp_interval.
> Why not simply:
> 
> - 	new_slave->last_arp_rx = jiffies;
> +	/* put it behind to avoid fake initial link up detection */
> +	new_slave->last_arp_rx = jiffies -
> +		 (msecs_to_jiffies(bond->params.arp_interval) + 1);

The idea was to avoid calculation when ARP monitoring is off. But
thinking it over again, this part of the code is not that performance
critical and the conditional jump may be in fact worse than the two
instructions it would jump over.

                                                       Michal Kubecek

--
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