netdev - Re: intermittant petabyte usage reported with broadcom nic

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Message-ID: <adak5whdvfe.fsf@cisco.com>
Date:	Thu, 12 Apr 2007 16:28:37 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	CaT <cat@....com.au>
Cc:	Michael Chan <mchan@...adcom.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: intermittant petabyte usage reported with broadcom nic

[Adding Michael Chan, who seems to look after bnx2, to the cc list]

 > To clarify it's an Intel Dual Core Xeon (I just wound up as thinking of
 > them all as amd64s). Network card driver in use is the one defined by
 > CONFIG_BNX2. Kernel's monolithic.

>From a quick look at bnx2.c, it seems that the driver gives the NIC
(firmware?) a block of memory to DMA stats into, and just reads from
that memory in its get_stats method.  So if you're seeing wonky stats
from the NIC intermittently, my best guess would be that firmware is
occasionally writing junk into the stats block.

 - R.
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