x86-64 on i386 (was Re: Promoting i386 version over x86_64?)

Paul Jakma paul at dishone.st
Mon Dec 14 18:17:10 UTC 2009

On Mon, 14 Dec 2009, Adam Williamson wrote:

> On Mon, 2009-12-14 at 12:33 +0000, Paul Jakma wrote:
>> You're missing the point.
>> If I put you in front of 2 identical machines, one running 32bit and
>> one 64bit software, would you be able to tell which one was which,
>> from the interactive performance of common applications? I'd be
>> willing to bet that for the vast majority of applications you
>> wouldn't be.

> That's a silly argument, because it simply relies on the fact that most
> uses of computers aren't CPU-bound at all. In the same way I could
> probably steal half the RAM from your system and clock the CPU down 50%
> (the BOFH's favourite revenue-generating technique!) and from 'the
> interactive performance of common applications' you wouldn't be able to
> tell the difference. I don't think that _means_ very much, though.

It's quite meaningful, e.g. for power conservation. As you no doubt 
are aware of, modern system regularly clock down the CPU.

Paul Jakma	paul at jakma.org	Key ID: 64A2FF6A
It occurred to me lately that nothing has occurred to me lately.

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