Re: [Intel-wired-lan] Opportunistic S0ix blocked by e1000e when ethernet is in use

[Kai Heng Feng]

at 6:25 PM, Neftin, Sasha <sasha.neftin@xxxxxxxxx> wrote:

> On 6/24/2019 18:06, Kai-Heng Feng wrote:
> > at 19:56, Neftin, Sasha <sasha.neftin@xxxxxxxxx> 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 properlyâ? Is this the  
sluggish connection I observed?

Kai-Heng

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