Re: [gentoo-user] Tips for saving power needed...

[Pandu Poluan]

On Apr 2, 2012 5:00 PM, "Robert David" <robert.david.public@×××××.com>
wrote:
>
> Hi,
>
> maybe write your hw configuration first. Eg: CPUs, graphic cards, HDDs
> (size, speed, type) and others.
>
> Also provide lspci output and /proc/cpuinfo.
>
> Then this is a server, maybe with more than one GB nic. If you dont use
> spare nics disable them in bios. Do the same with other unneeded stuff.
>
> If you can access your server and replace cards, remove everything you
> dont need. Do not lower fans or dont play with cpu voltage. If you want
> to run this server 24/7 it can cause serious problems. It will not save
> you much power. Paradoxly this could lead to higher power usage in
> some cases, because of hotter devices.
>
> Remove spare memory cards, if you dont need much memory, etc.
>
> Robert.
>
> V Sun, 01 Apr 2012 17:04:58 +0200
> Jarry <mr.jarry@×××××.com> napsáno:
>
> > Hi,
> >
> > admin of a colo-center keeps complaining my server is going
> > a little over power-limit (which they have set as ~120W per
> > 24h/avg, while my server needs ~130-135W). So I need to find
> > a way to save at least those 15W, or I will be moved to
> > higher tarif (which means higher costs for server-housing).
> >
> > Before going hard(ware) way, I would like to try first
> > all possible software solutions. What I tried up to now is
> > cpufreqd, CONFIG_NO_HZ=y, and spindown. In addition to that
> > I adjusted fan-speeds to a little lower values and turned
> > off some unneeded peripherials (in bios).
> >
> > Is there anything else I could do? Any tips would be greatly
> > welcomed...
> >
> > Jarry
> >
>
>

I'd rather have *more* RAM than causing unnecessary swaps.

Try using a smaller swapfile to reduce swap tendencies. You can always push
a larger swapfile into service when needed.

There's also a kernel knob to set 'swappiness', but I forget what exactly.
Try 'sysctl -a | grep swap'

Rgds,