big.LITTLE status for rk3399/rockpro64?

[William Carson]

> On Jul 15, 2020, at 8:29 AM, Josh Howard <bsd at zeppelin.net> wrote:
> 
> On Tue, 14 Jul 2020 08:18:53 -0700,
> Vincent Milum Jr wrote:
>> 
>> I can confirm that USB Mass Storage causes kernel panics ~50% of the time.
>> This happens during detection/initialization of the device.
>> Leaving the drive in during boot has the same chance of panic.
>> It is not 100%, as sometimes I can get the drive to register and use it.
>> I've yet to see any other USB device have an issue though.
>> I'm actively using a USB-3 hub with keyboard, mouse, and ethernet without
>> issue.
>> 
>>> 
>>> On rockpro64 it was (it's been a while since I've tested) very easy to
>>> trigger a panic doing anything usb related (sometimes just inserting a
>>> usb thumb drive would triggers it). This is why I've disabled the big
>>> cores on the rockpro64 image.
>>> 
>>> --
>>> Emmanuel Vadot <manu at bidouilliste.com>
>>> 
> 
> Attempting to use a USB3 drive does seem to lead to panics / hangs / generally
> bad behavior when combined with ncpu > 4. Are there any current leads as to
> what's behind the behavior?  Any relation to the RPI4 issues in the other
> threads? I've noticed USB drives on my RPI4 also exhibit somewhat similar
> behavior.

There is also the issue of corrupting NVMe drives, which is being tracked in
bug ID 243148. I have not tested it recently as there hasn't been any
indication it's been resolved/worked on, but if that's simply due to my own
ignorance, I'm happy to test again.