linux-kernel - Re: [PATCH 3/4] Make net watchdog timers 1 sec jiffy aligned

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]

Message-Id: <20070530105936.6c988da5.akpm@linux-foundation.org>
Date:	Wed, 30 May 2007 10:59:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 3/4] Make net watchdog timers 1 sec jiffy aligned

On Tue, 29 May 2007 11:01:13 -0700
Venki Pallipadi <venkatesh.pallipadi@...el.com> wrote:

> round_jiffies for net dev watchdog timer.
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> 
> Index: linux-2.6.22-rc-mm/net/sched/sch_generic.c
> ===================================================================
> --- linux-2.6.22-rc-mm.orig/net/sched/sch_generic.c	2007-05-24 11:16:03.000000000 -0700
> +++ linux-2.6.22-rc-mm/net/sched/sch_generic.c	2007-05-25 15:10:02.000000000 -0700
> @@ -224,7 +224,8 @@
>  	if (dev->tx_timeout) {
>  		if (dev->watchdog_timeo <= 0)
>  			dev->watchdog_timeo = 5*HZ;
> -		if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))
> +		if (!mod_timer(&dev->watchdog_timer,
> +			       round_jiffies(jiffies + dev->watchdog_timeo)))
>  			dev_hold(dev);
>  	}
>  }

Please cc netdev on net patches.

Again, I worry that if people set the watchdog timeout to, say, 0.1 seconds
then they will get one second, which is grossly different.

And if they were to set it to 1.5 seconds, they'd get 2.0 which is pretty
significant, too.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/