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SubjectRe: intermittant petabyte usage reported with broadcom nic
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Roland Dreier <rdreier@cisco.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
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