ac100 team mailing list archive
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Re: Stability Under Load
Am Freitag 19 August 2011, 11:18:31 schrieb Gordan Bobic:
> As some of you may have already heard on the IRC channel, I had my
> AC100 suddenly become very unstable under load. When doing big compile
> My gut feeling at the moment is that the RAM could be over-timed so I'm
> going to try modifying the kernel code to relax the RAM timings by a
we are not touching RAM timings so far on kernel 2.6.38. It may be possible that
the original kernels does so.
> The only competing idea is that Tegra2 comes pre-overclocked past the
> stable limits for 100% load for prolonged periods. This wouldn't
> surprise me either (Nvidia chips have proven unreliable in the past even
> at their default clock speeds, both the motherboard chipsets and GPUs),
> but I would like to think that Toshiba would have done some due
> dilligence testing of their product. For comparison, my SheevaPlug is
> compiling 24/7 for weeks at a time and has never errored out.
It could also be related to power supply. What we do is modifing the voltage
supplies for serveral power sources. I had the feeling, that Toshiba
undervoltaged some CPU supplies in order to save energy (compared to other
boards). So I increased SM1 from 1V to 1.2V which may have been wrong.
It would be nice if you could test a .32 based kernel and see if it also happens
there. Also you could try your new model.
Finially, it could also be possible that this is a design bug, which may be hard
to solve for us.