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Re: [PATCH] ACPI / sleep: EC-based wakeup from suspend-to-idle on recent systems

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  Re: [PATCH] ACPI / sleep: EC-based wakeup from suspend-to-idle on  recent systems Tom Lanyon <tom@oneshoeco.com> - 2017-07-06 13:50 +0200
    Re: [PATCH] ACPI / sleep: EC-based wakeup from suspend-to-idle on  recent systems Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2017-07-07 02:40 +0200

#1682370 — Re: [PATCH] ACPI / sleep: EC-based wakeup from suspend-to-idle on recent systems

Sorry for the slow response - I've just had a chance to run some more tests.

I tried to disable the SD card reader in the BIOS as suggested earlier
in the thread, but that didn't seem to make a significant change.
More inline below.

On Tue, 2017-06-27 at 17:03 +0200, Rafael J. Wysocki wrote:
> I would carry out s2idle under turbostat to see how much PC10
> residency is there while suspended.  That may be a significant factor.
>
> Most likely there is a device preventing the SoC from reaching its
> deepest low-power states under Linux on your system and it needs to be
> identified and dealt with.

I'm not entirely sure how turbostat records metrics so wasn't sure how
to measure correctly.  I kept turbostat running while performing a
s2idle and recorded the output:

https://gist.githubusercontent.com/tomlanyon/3238e742a155e7fa27658aa0960bdee4/raw/98b5f050e5eb2f88af47b2afd17080e7dd85d20f/turbostat

I'm not familiar with the output format - I see some high percentages
of C10, but nothing in Pkg%pc10. Which is of interest in this
scenario?

On 28 June 2017 at 02:14, Srinivas Pandruvada
<srinivas.pandruvada@linux.intel.com> wrote:
> Also make sure that you have no FW loading error for i915.
> #dmesg | grep i915
> It will display that Guc FW was loaded etc..
> The latest FW can be downloaded from
> https://01.org/linuxgraphics/downloads/firmware
>
> If you don't see PC10 residency, we can try something more.

I've confirmed that there's no FW errors for the i915.

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#1682829

On Thu, 2017-07-06 at 21:41 +1000, Tom Lanyon wrote:
> Sorry for the slow response - I've just had a chance to run some more
> tests.
> 
> I tried to disable the SD card reader in the BIOS as suggested
> earlier
> in the thread, but that didn't seem to make a significant change.
> More inline below.
> 
> On Tue, 2017-06-27 at 17:03 +0200, Rafael J. Wysocki wrote:
> > 
> > I would carry out s2idle under turbostat to see how much PC10
> > residency is there while suspended.  That may be a significant
> > factor.
> > 
> > Most likely there is a device preventing the SoC from reaching its
> > deepest low-power states under Linux on your system and it needs to
> > be
> > identified and dealt with.
> I'm not entirely sure how turbostat records metrics so wasn't sure
> how
> to measure correctly.  I kept turbostat running while performing a
> s2idle and recorded the output:
> 
> https://gist.githubusercontent.com/tomlanyon/3238e742a155e7fa27658aa0
> 960bdee4/raw/98b5f050e5eb2f88af47b2afd17080e7dd85d20f/turbostat
> 
> I'm not familiar with the output format - I see some high percentages
> of C10, but nothing in Pkg%pc10. Which is of interest in this
> scenario?
I see that you do have Pkg%pc10 of 86.56 in one interval. The system
was in Pkg%pc8 for multiple intervals before Pkg%pc10. So can you try
this also before your test?

# cd /sys/kernel/debug/pmc_core
# for i in {0..32}; do echo $i > ltr_ignore; done

Thanks,
Srinivas	

> 
> On 28 June 2017 at 02:14, Srinivas Pandruvada
> <srinivas.pandruvada@linux.intel.com> wrote:
> > 
> > Also make sure that you have no FW loading error for i915.
> > #dmesg | grep i915
> > It will display that Guc FW was loaded etc..
> > The latest FW can be downloaded from
> > https://01.org/linuxgraphics/downloads/firmware
> > 
> > If you don't see PC10 residency, we can try something more.
> I've confirmed that there's no FW errors for the i915.

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