netdev - Re: occasionally corrupted network stats in /proc/net/dev

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Date:	Mon, 14 Jan 2008 15:05:21 -0500
From:	Mark Seger <Mark.Seger@...com>
To:	Michael Chan <mchan@...adcom.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Ben Greear <greearb@...delatech.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: occasionally corrupted network stats in /proc/net/dev

outstanding!  I'm just happy to hear it's not a bug in my monitoring 
code...  8-)
-mark

Michael Chan wrote:
> On Mon, 2008-01-14 at 20:12 +0100, Eric Dumazet wrote:
>   
>> Mark Seger a écrit :
>>     
>>> Ignore that last one as it was pointed out to me that we have both nic 
>>> installed on many of our systems and ethtool told me the one 
>>> associated with the nic is actually the broadcom one.
>>>
>>> version:        1.4.38 E1B1EC867DEEB8027B2DA0F
>>> license:        GPL
>>> description:    Broadcom NetXtreme II BCM5706/5708 Driver
>>>
>>>       
>> I remember some tg3 chips actually have bugs when reporting stats.... 
>> once in a while
>>
>> CCed to Michael Chan to get some details.
>>     
>
> Yes, that's right.  Some BNX2 chips have this problem and we have a
> workaround:
>
> http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commit;h=02537b0676930b1bd9aff2139e0e645c79986931
>
> The chip sometimes DMA wrong counter values if the chip is also
> internally gathering the counters at the time of the DMA.
>
> Driver 1.5.11 and later versions have this workaround.
>
>
>   

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