[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
> 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
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.
> David Mathog
> mathog at caltech.edu
> Manager, Sequence Analysis Facility, Biology Division, Caltech
> Beowulf mailing list, Beowulf at beowulf.org
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