netdev - Re: [PATCH] net: add ability to clear stats via ethtool

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Message-ID: <20080603123520.GF18161@solarflare.com>
Date:	Tue, 3 Jun 2008 13:35:22 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	James Cammarata <jimi@...x.net>
Cc:	Bill Fink <billfink@...dspring.com>, linux-kernel@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: add ability to clear stats via ethtool - e1000/pcnet32

James Cammarata wrote:
> >First of all, when assisting a user, they typically aren't even
> >running an snmp daemon (and there might be firewall issues to
> >access it if they are).  And I don't think the "ethtool -S" driver
> >stats are even accessible via SNMP (although they may contribute
> >to more generic interface stats which are), and it is the specific
> >driver stats which are often key to help diagnosing the problem.
> 
> Ok, just to jump back in and add my $0.02, I plan to send a patch to 
> the ethtool project to do what was suggested (snapshot to /var, and 
> diff stats against that for future reference).  I would just like to 
> point out that this will introduce inconsistencies between _every_ 
> other source of interface stats (ifconfig/procfs/etc).  I can deal 
> with that, it just means one more thing to keep track of when you're 
> troubleshooting.

You could perhaps add a third column to the statistics when a snapshot
exists, with the second column still showing absolute values and the
third showing the difference from the snapshot.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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