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Message-ID: <p73hcrl6pm8.fsf@bingen.suse.de> Date: 13 Apr 2007 03:15:59 +0200 From: Andi Kleen <andi@...stfloor.org> To: Roland Dreier <rdreier@...co.com> Cc: CaT <cat@....com.au>, 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 Roland Dreier <rdreier@...co.com> writes: > [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. When only the firmware is writing to that area it could be put into an own page and then write protected with change_page_attr() That would catch any corruption coming from the rest of the kernel. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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