On Sun, Aug 21, 2011 at 02:14:28PM +0100, Gordan Bobic wrote: > On 08/21/2011 01:57 PM, Julian Andres Klode wrote: > >975mV might be equal to 1000mV, there is some rounding up involved, > >and as far as I know, the frequency steps are 50mV. > > Really? I the error I was seeing was specifically mentioning 975mV. It might be stepping in 25 mV now, I don't know, but there is definitely a call to a MACRO with ROUND_UP in the name in the DVFS.
> Hmm, it seems my /sys/kernel/debug subtree is empty. I'll have a > poke through the kernel config and enable it next time I'm > rebuilding a kernel. You need to mount a debugfs there. > Indeed, but there could be some weird interraction going on. Do you > have vmalloc= in your kernel boot parameters? Not related. I had booted with vmalloc and with vmalloc=320M, does not make a difference. > >You always need to remember that this value is just a maximum for the > >regulator, it is not fixed. In your case, the regulator scales from > >725mV to 975mV, in 50(?) mV steps. > > Indeed, but with the performance governor set, it should never drop > below the max. Who knows what really happens there. > >It's most likely not memory related, but a bug in voltage > >scaling. I currently have DVFS disabled, and the build seems > >to be running without errors, whereas it would error out after > >a few minutes with DVFS enabled. > > Is this still relevant with the performance governor enabled, > though? I was seeing errors with the performance governor, which I > would expect to cause the voltages to never get changed. I'm only running with performance and expected the errors there. I then disabled DVFS via /sys/module/tegra2_dvfs/parameters/ (first core, then cpu) and started the build again and got no error yet. -- Julian Andres Klode - Debian Developer, Ubuntu Member See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
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