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Old 10-03-2011, 02:12 PM
Martin Langhoff
 
Default F-16 suspends my *desktop* after 30 minutes at the gdm , making it impossible to ssh in

On Sun, Oct 2, 2011 at 4:13 PM, Jason D. Clinton <me@jasonclinton.com> wrote:
>> 2) The machine has a server function. In this case working wake on lan and
>> * *stay active on lan are a must have and until we have those it should not
>> * *auto suspend.
>
> WOL for a network server is madness. It shouldn't have been suggested.

Well, it's not well supported now across the stack, but it is surely
not madness.

On the XO hardware we actually use WOL while there peer-to-peer
network connections up. On x86 the wakeup time is not so good. On the
upcoming ARM model, the wakeup time is expected to be very low. We are
sorting out wakeup right now so can't really say, but surely <100ms.

This means that blade servers running ARM (or any SoC where power mgmt
has been well designed) can be drawing ~250mw in a suspend that looks
a lot like a very deep sleep. No fans, no "aircon footprint".

Are there things to resolve on the way to making this practical? Definitely!

Should we be riding the "I want lower power draw / fast+transparent
suspend/deep-idle on my netbook" wave to benefit the server space? I
sure think so.

> A fully power-saved Sandy Bridge laptop in the state you lay out above
> is around 7W. A suspended laptop from the same generation consumes
> roughly 0.4W of power. Stand-by is 0.1W.

Interesting numbers. The big questions is -- does it suspend and
resume fast and transparently enough that you can treat suspend as a
"very deep idle"?

And how fast can we bring those improvements to the much bigger
numbers you have for servers.




m
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Old 10-03-2011, 03:09 PM
Przemek Klosowski
 
Default F-16 suspends my *desktop* after 30 minutes at the gdm , making it impossible to ssh in

On 10/03/2011 05:37 AM, Nicolas Mailhot wrote:

> 3. uses a high efficiency low-noise PSU, which does not like power ups
> at all (in fact restarting the computer now takes a dozen tries, with
> minutes waiting for caps to drain ; yes I could change the hardware but
> it works fine under load and a new PSU is how many years of energy
> savings again ?).

If your PS has trouble starting because of faulty caps, it's probably
not because they are draining---on the contrary, they are probably worn
out and leaky (electrically), causing trouble for the startup circuit
which wasn't designed for the extra losses. Often you can identify the
failing electrical capacitors because their casing is swollen or maybe
even burst open and leaking the actual electrolyte.

http://en.wikipedia.org/wiki/Capacitor_plague

You'd have to disassemble the power supply to see that, however, and
there are possibly dangerous voltages inside even for some time after
disconnecting the power, so I don't recommend doing that.

The bottom line is that the power supply is probably on the fritz and
likely to fail altogether. Decent power supplies aren't that expensive,
I recently got a nice, quiet one for around $30-40.
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Old 10-04-2011, 08:36 AM
"Nicolas Mailhot"
 
Default F-16 suspends my *desktop* after 30 minutes at the gdm , making it impossible to ssh in

Le Lun 3 octobre 2011 17:09, Przemek Klosowski a écrit :

> The bottom line is that the power supply is probably on the fritz and
> likely to fail altogether. Decent power supplies aren't that expensive,
> I recently got a nice, quiet one for around $30-40.

Thanks, but it's perfectly fine under load, so I don't see the point of
changing it prematurely. It just does not like shutdowns

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Old 10-04-2011, 09:58 AM
Richard Hughes
 
Default F-16 suspends my *desktop* after 30 minutes at the gdm , making it impossible to ssh in

On 3 October 2011 08:57, Richard Hughes <hughsient@gmail.com> wrote:
> That's what it was supposed to be, but due to an oversight on my part
> the wrong keys were being set. I've fixed this upstream in
> https://bugzilla.gnome.org/show_bug.cgi?id=660395 -- which will of
> course be included in 3.2.1

I've done a test build here for anyone interested:
http://koji.fedoraproject.org/koji/taskinfo?taskID=3401483

Richard.
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