Re: [lm-sensors] [PATCH 1/2] k8temp warn about errata

[Jean Delvare <khali@linux-fr.org>]

On Tue, 18 Nov 2008 10:46:03 -0700, Jordan Crouse wrote:
> Nothing scientific.  The AMD errata team might know more about it.  I 
> can identify the obviously broken sensors - my athlon X2 system for 
> example tells me the cores are 7C and 3C respectfully, but I don't know 
> if you could tell the difference between a well working sensor and a 
> marginally working sensor, especially with differing work conditions. 
> The best you could do is to figure out how cold the core could possibly 
> run, and then omit anything under that.
> 
> You might do a better job if you could compare the core temperature 
> against the system monitor - they should only differ by a few degrees (I 
> think there is some math about how much the external and internal diodes 
> should differ).  That said, thats not the sort of math you could do in 
> the kernel driver, you would need the user land to find the other sensor 
> and do the calculations.

This is the problem: the k8temp driver doesn't have access to other
sensors for comparison purposes. Even if it had, it wouldn't know which
sensor corresponds to the CPU (this is motherboard-specific.) So while
this can be used by the user to determine whether his CPU sensors are
working or not, this cannot be used as a way to automatically discard
CPUs with broken sensors.

-- 
Jean Delvare

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