[Beowulf] Power savings at idle, especially Tyan S2466N-MPX

Robert G. Brown rgb at phy.duke.edu
Tue Oct 4 12:54:45 PDT 2005

David Mathog writes:
> This gives a pretty good clue why:
>  %  modprobe processor
>  %  cat /proc/acpi/processor/CPU0/info
>  processor id:            0
>  acpi id:                 0
>  bus mastering control:   no
>  power management:        no
>  throttling control:      no
>  limit interface:         no
>  /proc/acpi/processor/CPU0/power
>  showed that only C1 was supported.  On the ASUS boards both C1 and
>  C2 were present.
> So my question for this group is, has anybody managed to get
> a Tyan S2466N-MPX to use the lower power idle mode?  Is this just
> a case of upgrading to a newer Kernel, changing some BIOS
> setting , or is this yet another broken feature of the
> S2466N-MPX (along with WOL)?

I vaguely recall something like you have to put the nodes into the right
mode by hand on every boot?  Or was that to enable monitoring the nodes
at all?

I wouldn't be surprised to find that this is YATBB (yet another tyan
bios bug) in the 2466.

What did google turn up?


> Note that the BIOS has ACPI set to YES and "power savings" set
> to disabled.  The latter was set that way because I did NOT
> want the nodes going into standby or "auto suspend".  The other
> modes listed are "customized", "maximum power savings", "maximum
> performance" - none of which are defined.  It may
> be though that this must be set to "customized" and the standby
> and auto suspend timeouts set to off in order for the low
> power idle mode to work.  No way to figure that out from the 
> documentation (sic). All of these nodes are currently in use
> in the cluster, so it's a bit hard to experiment on them
> at this time.  Hopefully one of you has already been through
> this and has some answers.
> Thanks,
> David Mathog
> mathog at caltech.edu
> Manager, Sequence Analysis Facility, Biology Division, Caltech
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