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Re: Stability Under Load


On Sat, Aug 20, 2011 at 05:27:18PM +0100, Gordan Bobic wrote:
> On 08/20/2011 05:25 PM, Gordan Bobic wrote:
> >On 08/20/2011 04:47 PM, Julian Andres Klode wrote:
> >>On Sat, Aug 20, 2011 at 04:33:17PM +0100, Gordan Bobic wrote:
> >>>On 08/20/2011 04:07 PM, Julian Andres Klode wrote:
> >>>>On Sat, Aug 20, 2011 at 03:31:56PM +0100, Gordan Bobic wrote:
> >>>>>Which kernel are you using?
> >>>>
> >>>>A somewhat older build of Marc's kernel (one month), the one
> >>>>I have in my Debian repository + the change to use 1000 instead
> >>>>of 1200.
> >>>
> >>>I presume you mean 1200mV rather than 1200MHz. If it's 1200MHz, I'd
> >>>like to know where to tweak that. ;)
> >>
> >>I never said anything of Hz. It's all mV (if it's mV, what are 1.2V
> >>used for? The voltage from the battery/charger is clearly 10-12V).
> >>
> >>>Well, my testing has been going on for 6+ hours. Considering I
> >>>couldn't get an hour without errors before (and sometimes
> >>>several/hour, and that's just the detected ones), I'd say it's a
> >>>very definitive improvement. So much so that I'm vaguely tempted to
> >>>try reducing it to 950mV. ;)
> >>
> >>Given that the minimum it currently scales to would be 725, 950
> >>is certainly save.
> >
> >Seems there are limits in hardware. I built a kernel with the upper
> >bound set to 900, and now I get a lot of this in the logs, while the CPU
> >is stuck at 216MHz:
> >
> >Failed to set dvfs regulator vdd_cpu
> >Failed to set regulator vdd_cpu for clock cpu to 875mV
> ^^^^^^^^^^^^^^^^
> This should have read 975mV
> >cpu-tegra: Failed to set cpu frequency to 1000000kHz
> >
> >over, and over and over.

I get the same problem when setting SM1 to a maximum of 1000mV,
because dvfs tries to set it to 1100 mV, which fails. And
extreme instability.

Harmony sets minimum voltage to 750 and maximum voltage to 1125,
maybe that gives more stability?

Julian Andres Klode  - Debian Developer, Ubuntu Member

See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.

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