cvs commit: src/sys/kern subr_pcpu.c

Bernd Walter ticso at
Fri Sep 30 05:49:15 PDT 2005

On Fri, Sep 30, 2005 at 05:28:59AM +1000, Peter Jeremy wrote:
> On Thu, 2005-Sep-29 19:46:02 +0200, Wilko Bulte wrote:
> >> I remember my old sparcstation hardware at CMU with some fondness for this 
> >> reason -- on a cold Pittsburgh evening, overheating computer hardware was 
> >> strictly necessary, even in the presence of decent radiators.  However, 
> >> with 14+ cooling fans for one machine, it did need to be a couple of rooms 
> >> down.
> >
> >Hum, yes.  That is why I handed down my AS4100 to ticso ;)
> Compared to ES40/ES45's, AS4100's run very cool and I think they're quieter.

A major difference is that EV6 CPUs have more advanced power management
features, while the EV56 in AS4100 even burn lots of power when idle :(
But there is still much we could do from software to spare power on all
alpha systems - I plan to do measurements with idle-loops soon.
Yes - AS4100 are quitely, you don't really hear much from it in my server
But I don't have to pay for noise, power is the critical point.

> If you want to warm things up, try a 42U cabinet full of SunFire V440's.


B.Walter                   BWCT      
bernd at                                  info at

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