I notice that the 0.93 MinnowBoard MAX has the following changes (per the
release notes):
===============================================================================
4. SUPPORTED (NEW) FEATURES AND CHANGES IN RELEASE
================================================================================
.
.
.
6. Main changes in this release
1) Enabled PCIe port 1;
...
3) Enabled Spread Spectrum of several devices;
...
Personally I am always concerned when clocking gets changed in a system (i.e.
note #3), and in this case it may be mild paranoia on my part. Though if the
failure is intermittent, it could be related to a the spread spectrum change.
My experience has been when manipulating clock frequencies in a system, if it
results in creating an issue, the issue tends to be asynchronous and variable:
Either happens only 1 out of every n (n possibly being variable as well) runs,
or happens in a wildly variable time frame (takes as little as 2 seconds and as
long as 12 hours) to failure, regardless of environmental issues. Especially
when the hardware is not the same as the initial target of the firmware
(propagation and signal time deltas can make the timing changes more impactful
on different hardware).
But also note #1, enabling the PCIe port 1, could this contribute to PCIe
disconnects in the custom hardware?
Sincerely,
Michael Krau
-----Original Message-----
From: elinux-MinnowBoard [mailto:[email protected]]
On Behalf Of David Scully
Sent: Wednesday, September 07, 2016 4:19 PM
To: [email protected]
Subject: Re: [MinnowBoard] MinnowBoard MAX 0.93 64-Bit & network lost
John,
I was able to do a bit more testing today comparing our board to the
Minnowboard Max.
With 0.93 firmware on the Minnowboard Max (8111gs) I was unable to reproduce
this issue running 16.04.
I actually have a second drive loaded with Ubuntu 14.04 (which uses kernel
3.16) and was able reproduce on our custom board using the iperf tests. So I'm
not sure you'd be more likely to see this under a newer kernel. Whether it
becomes more common is unclear -- I had to run my test for a bit longer
(30 min test) on 14.04 before the disconnect message.
I'm a bit worried that this is a HW problem on our end, but it's still odd to
me that 0.92 works without PCIe disconnects.
It would be nice to see Abdelghani's dmesg when the connection fails to see if
we're running into similar problems. Unlike Abdelghani, when the NIC
disconnects the only way I'm able to save it is a full reboot. Perhaps the
8111gs driver is better at recovering from this condition or he isn't seeing
PCIe disconnects at all?
--
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