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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] IP: Increment INADDRERRORS if routing for a packet is
 not successful
Date: Wed, 02 Jun 2010 10:12:58 -0700 (PDT)
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From: Christoph Lameter <cl@linux-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.