Linux freezes after a time while running

[Michal Kazior]

On 2 November 2016 at 10:00, Conrad Kostecki <ck+ath10k at bl4ckb0x.de> wrote:
> Hi!
>
>> Michal Kazior <michal.kazior at tieto.com> hat am 2. November 2016 um 04:31 geschrieben:
>> I suspect the pcie link gets broken one direction because attempting a
>> cold reset did crash the host even harder.
>
> What I can see, the WiFi runs stable, if nobody connects to it. The failure starts, when somebody connects and does some throughput.
>
>> Looks like the device went into a very confused state due to pcie link
>> failure starting from:
>
> Well, I did a test and removed the Mikrotik RB14e, as it has a PLX chip and provides an extra pcie switch. Instead, I took a simple passive miniPCIe->PCIe adapter and build only one card into it. The problem still exists. So, the RB14e is not the cause at least.
>
>>   [ 691.609836] pcieport 0000:00:02.0: AER: Multiple Uncorrected
>> (Non-Fatal) error received: id=0800
>
> I see, so the firmware crash it not the cause, but the error reported by AER. Thanks for clarify!
>
>> I'm not really familiar with these. Perhaps there's a pcie bridge
>> problem on your host platform or maybe an electrical issue (e.g.
>> insufficient power supply to handle short bursts?).
>
> Well, the mainboard is microATX. So its powered by a Seasonic 400W passive PSU, but the whole system takes about 40-50w. So the PSU itself should be enough? ;-) IIRC PCIe should provide up to 75W?
>
> I am out of ideas.. I know, a year ago, that cards were perfectly working. Even a test replacement shows the same errors, so it's not a defective card.

Were the cards working with this particular microATX mainboard before though?

Maybe the adapter is to blame? Or maybe it's a faulty mobo? You could
try reducing txpower of the card with "iw" and see if it makes a
difference.


Michal