Anyone else see host machine lockups?

Anyone else see host machine lockups?

[Ben Greear]

We can reliably lock up a host system (no splats, no mention of
firmware crashes, system just dies) when we bring up or down a
bunch of vifs in a system with 3 radios in a PC.

Anyone else seeing similar?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

Re: Anyone else see host machine lockups?

[Adrian Chadd]

Heh, no, but back in the day this'd happen if the DMA engine wasn't
shut down in the right order. The NIC would start DMAing crap all over
random memory.

I wonder if that's happening here.



-a


On 18 April 2014 13:09, Ben Greear <greearb@candelatech.com> wrote:
> We can reliably lock up a host system (no splats, no mention of
> firmware crashes, system just dies) when we bring up or down a
> bunch of vifs in a system with 3 radios in a PC.
>
> Anyone else seeing similar?
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb@candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k

_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

Re: Anyone else see host machine lockups?

[Ben Greear]

On 04/19/2014 07:41 AM, Adrian Chadd wrote:
> Heh, no, but back in the day this'd happen if the DMA engine wasn't
> shut down in the right order. The NIC would start DMAing crap all over
> random memory.
>
> I wonder if that's happening here.

Maybe, but I would hope that such a problem would at least often crash
the OS with some strange crashes as opposed to just silent host lockup?

Thanks,
Ben

>
>
>
> -a
>
>
> On 18 April 2014 13:09, Ben Greear <greearb@candelatech.com> wrote:
>> We can reliably lock up a host system (no splats, no mention of
>> firmware crashes, system just dies) when we bring up or down a
>> bunch of vifs in a system with 3 radios in a PC.
>>
>> Anyone else seeing similar?
>>
>> Thanks,
>> Ben
>>
>> --
>> Ben Greear <greearb@candelatech.com>
>> Candela Technologies Inc  http://www.candelatech.com
>>
>>
>> _______________________________________________
>> ath10k mailing list
>> ath10k@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/ath10k


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

Re: Anyone else see host machine lockups?

[Michal Kazior]

On 18 April 2014 22:09, Ben Greear <greearb@candelatech.com> wrote:
> We can reliably lock up a host system (no splats, no mention of
> firmware crashes, system just dies) when we bring up or down a
> bunch of vifs in a system with 3 radios in a PC.
>
> Anyone else seeing similar?

From what I understand this seems to be faulty CUS hardware design.
The problem occurs when trying to perform cold reset on target device
which sometimes leads to voltage drops/spikes which in turn breaks
PCI-E link. Some host controllers apparently can't deal with it and
hang the whole machine (e.g. Thinkpad T430), while others just lose
connectivity with the device and need re-plugging (e.g. Dell E6420) or
display a splat and need to be restarted before given PCI-E slot can
be used again (e.g. AP135's "Data bus error").


Michal

_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

Re: Anyone else see host machine lockups?

[Ben Greear]

On 04/21/2014 11:53 PM, Michal Kazior wrote:
> On 18 April 2014 22:09, Ben Greear <greearb@candelatech.com> wrote:
>> We can reliably lock up a host system (no splats, no mention of
>> firmware crashes, system just dies) when we bring up or down a
>> bunch of vifs in a system with 3 radios in a PC.
>>
>> Anyone else seeing similar?
>
>>From what I understand this seems to be faulty CUS hardware design.
> The problem occurs when trying to perform cold reset on target device
> which sometimes leads to voltage drops/spikes which in turn breaks
> PCI-E link. Some host controllers apparently can't deal with it and
> hang the whole machine (e.g. Thinkpad T430), while others just lose
> connectivity with the device and need re-plugging (e.g. Dell E6420) or
> display a splat and need to be restarted before given PCI-E slot can
> be used again (e.g. AP135's "Data bus error").

I see this on WLE900VX NICs as well, so it's not just a CUS issue.

And, I don't think it is just cold-reset, because I do not see any
console messages about attempting a cold reset.

Thanks,
Ben

>
>
> Michal
>


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k