netdev - Re: [PATCH] IP: Increment INADDRERRORS if routing for a packet is not successful

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Date:	Wed, 2 Jun 2010 13:41:06 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, cl@...ux-foundation.org,
	netdev@...r.kernel.org, shemminger@...tta.com
Subject: Re: [PATCH] IP: Increment INADDRERRORS if routing for a packet is
 not successful

On Wed, Jun 02, 2010 at 07:19:10PM +0200, Eric Dumazet wrote:
> Le mercredi 02 juin 2010 à 10:12 -0700, David Miller a écrit :
> > From: Christoph Lameter <cl@...ux-foundation.org>
> > Date: Wed, 2 Jun 2010 11:49:18 -0500 (CDT)
> > 
> > > On Wed, 2 Jun 2010, Eric Dumazet wrote:
> > > 
> > >> take a look at
> > >>
> > >> http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/html/SystemTap_Beginners_Guide/useful-systemtap-scripts.html#dropwatch
> > > 
> > > System tap?
> > 
> > You don't need to use system tap, just the normal tracing stuff using
> > sysfs files suffices.
> > 
> 
> It would be good if Neil could gave us a man page or something ;)
> 
That stap script was really meant to be a stopgap measure.  As mentioned, you
can use the debugfs interface to turn tracepoints on and use them anyway you
wish.  Or, if you want to use the kfree_skb and napi_poll tracepoints in a more
formalized way, you can use the dropwatch user space utility:

https://fedorahosted.org/dropwatch/

Which includes a man page on usage :)

I also recently updated it so that this utility can query /proc/kallsyms to
translate program counter values into symbollic names and offsets for you. :)

Regards
Neil

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