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SubjectRe: [Intel-wired-lan] Opportunistic S0ix blocked by e1000e when ethernet is in use
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at 6:25 PM, Neftin, Sasha <sasha.neftin@intel.com> wrote:

> On 6/24/2019 18:06, Kai-Heng Feng wrote:
>> at 19:56, Neftin, Sasha <sasha.neftin@intel.com> wrote:
[Snipped]
> Current HW have a limitation. Please, try follow workaround on your
> platform: echo 3 > /sys/kernel/debug/pmc_core/ltr_ignore

Yes, this does the trick.

On 4.15 based kernel I can see the SoC enters PC10 but SLP_S0 is not
asserted.

On mainline kernel the SoC, PC10 is hit and SLP_S0 is asserted. Once SLP_S0
is asserted the SSH connection becomes really sluggish.

>> >> S0ix support is under discussion with our architecture. We will try
>>> enable S0ix in our e1000e OOT driver as first step.
>> Is it possible to add Dynamic LTR as an option so users and downstream
>> distros can still benefit from it?
> As I said before, this is not a stable solution. No guarantee that HW
> will work as properly.

Can you describe the symptom of "HW will work as properly”? Is this the
sluggish connection I observed?

Kai-Heng

>> Kai-Heng
>>>> Kai-Heng
>>>>> Kai-Heng
>>>> _______________________________________________
>>>> Intel-wired-lan mailing list
>>>> Intel-wired-lan@osuosl.org
>>>> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan
>>>
>>> Thanks
>>> Sasha


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