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

From: Andrew Morton <[email-masked]>
Date: Wed, 30 May 2007 10:59:36 -0700

On Tue, 29 May 2007 11:01:13 -0700
Venki Pallipadi <[email-masked]> wrote:

> round_jiffies for net dev watchdog timer.
> 
> Signed-off-by: Venkatesh Pallipadi <[email-masked]>
> 
> 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.