netdev - Re: [net-next PATCH] igb: update adapter stats when reading /proc/net/dev.

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Message-Id: <1286446004.6992.7.camel@firesoul.comx.local>
Date:	Thu, 07 Oct 2010 12:06:44 +0200
From:	Jesper Dangaard Brouer <hawk@...x.dk>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	jeffrey.t.kirsher@...el.com
Subject: Re: [net-next PATCH] igb: update adapter stats when reading
 /proc/net/dev.

On Wed, 2010-10-06 at 23:46 -0700, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 07 Oct 2010 08:44:08 +0200
> 
> > Le mercredi 06 octobre 2010 à 23:36 -0700, David Miller a écrit :
> >> From: Jesper Dangaard Brouer <hawk@...x.dk>
> >> Date: Tue, 05 Oct 2010 16:18:33 +0200
> >> 
> >> > Network driver igb: Improve the accuracy of stats in /proc/net/dev, by
> >> > updating the adapter stats when reading /proc/net/dev.  Currently the
> >> > stats are updated by the watchdog timer every 2 sec, or when getting
> >> > stats via ethtool -S.
> >> > 
> >> > A number of userspace apps read these /proc/net/dev stats every second,
> >> > e.g. ifstat, which then gives a perceived very bursty traffic pattern,
> >> > which is actually false.
> >> > 
> >> > Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk>
> >> 
> >> I assume that the Intel folks will take care of integrating this
> >> now that the locking is fixed.
> > 
> > I integrated Jesper patch into my cumulative patch.
> 
> Ok.

I'm fine with this, as long as the commit message describe this change
of accuracy of stats in /proc/net/dev.

Something like:

 This patch also increase the accuracy of stats in /proc/net/dev, by
 updating the adapter stats when reading /proc/net/dev.  Previously
 the stats were only updated by the watchdog timer every 2 sec, which
 resulted in false observations from userspace.


-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network Kernel Developer
  Cand. Scient Datalog / MSc.CS
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer


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