Dear David,

first of all thanks for your quick answer! This is what I call great
support from a hardware vendor!! :-)

Graham, David wrote:
quoted text
> Thanks for reporting this issue. We have witnessed this in our labs too,
> only on platforms that have BMC management firmware. I'm very familiar
> with the problem, and believe that we have fixed it, though the
> application of the fix may not be simple. The problem is a result of
> improper synchronization between the platform FW and the e1000e driver
> when they attempt concurrent access to LAN resources, and fixes were
> made both on the driver side, and on the FW side. On some platforms a
> simple driver update resolves the problem, others require FW fixes too.

That sounds quite promising and seems to fit to our problem.

However, one detail confuses us: we can currently reproduce this problem on
two machines. One of them is equipped with an optional IPMI card, the other
one isn't. (The Supermicro X7DB3 doesn't include full IPMI support onboard,
but has a "LP IPMI 2.0 (SIMLP) Slot" where you can place an optional card).

The box with the IPMI card shows the hardware errors quite often (in one of
about 200 tries) while the other box still shows the problem, but much more
seldom (in one of >1000 tries). Now we wonder if the BMC is on the IPMI
card or on the board itself - in the first case, I'm not sure if you thesis
fully explains the problems we can see.

And there's another detail I'd like to mention: we first found the problem
by doing continuous reboots as originally described, but we found we can
also reproduce it with an endless loop of "rmmod;sleep 3;modprobe". Does
this somehow contradict with your thesis?

quoted text
> There have been further improvements made to the driver synchronization
> code since the 0.3.3.3-k2 driver, and it is possible that a newer driver
> would resolve the issue. It'd be good for us to know if that's the case.
> The driver version is not yet (AFAICS) upstream, but is already
> available in the standalone e1000e-0.4.1.7 driver on sourceforge.
> (google "sourceforge e1000e"). Would you be able to try that, as a first
> step ? 

Yes, I did. Unfortunately, 0.4.1.7 still shows the problem - on both machines:

e1000e: Intel(R) PRO/1000 Network Driver - 0.4.1.7-NAPI
e1000e: Copyright (c) 1999-2008 Intel Corporation.
ACPI: PCI Interrupt 0000:06:00.0[A] -> GSI 18 (level, low) -> IRQ 18
PCI: Setting latency timer of device 0000:06:00.0 to 64
0000:06:00.0: 0000:06:00.0: Hardware Error
0000:06:00.0: eth0: (PCI Express:2.5GB/s:Width x4) 00:30:48:66:c7:06
0000:06:00.0: eth0: Intel(R) PRO/1000 Network Connection
0000:06:00.0: eth0: MAC: 5, PHY: 5, PBA No: 2050ff-0ff
ACPI: PCI Interrupt 0000:06:00.1[B] -> GSI 19 (level, low) -> IRQ 19
PCI: Setting latency timer of device 0000:06:00.1 to 64
0000:06:00.1: eth1: (PCI Express:2.5GB/s:Width x4) 00:30:48:66:c7:07
0000:06:00.1: eth1: Intel(R) PRO/1000 Network Connection
0000:06:00.1: eth1: MAC: 5, PHY: 5, PBA No: 2050ff-0ff
0000:06:00.0: eth0: Hardware Error
0000:06:00.0: eth0: Hardware Error
0000:06:00.0: eth0: Hardware Error
0000:06:00.0: eth0: Hardware Error
0000:06:00.0: eth0: Hardware Error

Is there any further debug code I could add to narrow down things?

quoted text
> If this does not resolve the issue for the Supermicro board, you likely
> also require a "FW-side" fix, and this comes in one of two flavors. If
> the board has an INTEL BMC, then we will need to update it with a new
> BMC version. If the board has a Supermicro BMC (I expect that it does),
> then we can provide a patch to some of the platform microcode using a
> EEPROM update.  To determine which is appropriate for you, we'll need to
> know more about the platform. There's probably a BMC version number on
> one of the BIOS menus. I can work with you to find the info we need, and
> then, to help you to perform the necessary steps to perform an upgrade. 

Sorry, but we can't provide any further details about this yet. We still
try to get through to the Supermicro developers, but so far our FAE contact
insists on telling us "don't use e1000e, e1000 is the right driver for your
hardware".

-- 
Gernot Hillier
Siemens AG, CT SE 2
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