netdev - Re: [RFC] netdev: debugging option

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Message-ID: <20080804093742.395d271e@extreme>
Date:	Mon, 4 Aug 2008 09:37:42 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	greearb@...delatech.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [RFC] netdev: debugging option

On Sun, 20 Jul 2008 00:05:09 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Hemminger <shemminger@...tta.com>
> Date: Sat, 19 Jul 2008 23:04:24 -0700
> 
> > This adds a debugging option for network devices. It could grow to add other
> > uses, but for now just add some messages about device reference counting.
> > 
> > Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> 
> I think this is useful but it could use some minor
> mods before we put it in.
> 
> For example, this thing will spam the logs in at least two
> common cases:
> 
> 1) Lots of routing cache replacements
> 
> 2) For older drivers using netif_rx() (and therefore, every
>    current tunnel), every RX packet will trigger a log message

Fixed by later patch.

> So we really need to add some kind of run time enable and also a
> filter of some sort, even if it's just on device.

The sysctl in the patch is default off, so unless it is turned on,
the log is quiet
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