Problems writing to intel P3700 NVMe drive

[Pavilion Storage]

The root cause might be a bug in the kernel where pcie devices are
configured. Setting it to 128B will work, but may not perform to the
best capabilities allowed by the device and RC. If we have multiple
drives from different manufacturers in the system, we may penalize the
drive that has the hardware capability to handle higher MPSS.

thx
Kishore


On Thu, May 28, 2015 at 2:03 PM, Keith Busch <keith.busch at intel.com> wrote:
> Perhaps not a desirable/permanent solution, but for everyone's benefit,
> we can work-around the problem with kernel parameter:
>
>   pci=pcie_bus_safe
>
> Using 'pcie_bus_perf' instead may also work, though your original
> solution of just using x86 sounded perfectly reasonable to me. :)
>
> On Thu, 28 May 2015, Pavilion Storage wrote:
>>
>> Thanks to Keith Busch for the providing the clues.
>> The problem was that the PCIe MPSS on the drive and the CPU root
>> complex did not match and that caused a problem. Setting it to a
>> common value fixed the problem.
>> Kishore