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

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Date:	Tue, 05 Oct 2010 16:41:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: [net-next PATCH] igb: update adapter stats when reading
 /proc/net/dev.

Le mardi 05 octobre 2010 à 16:18 +0200, Jesper Dangaard Brouer a écrit :
> 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>

Unfortunately this is racy with igb_watchdog_task()

igb_update_stats() must be called under protection of a lock.



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