Message-ID: <446DFEB8.8020302@comcast.net>
Date: Fri, 19 May 2006 13:22:00 -0400
From: John Richard Moser <nigelenki@comcast.net>
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To: Panagiotis Issaris <takis@lumumba.uhasselt.be>
CC: linux-kernel@vger.kernel.org
Subject: Re: Stealing ur megahurts (no, really)
References: <446D61EE.4010900@comcast.net> <446DA5B0.8020703@lumumba.uhasselt.be>
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Panagiotis Issaris wrote:
> Hi,
> 
> John Richard Moser wrote:
> 
>> [...]
>> Scrambling for an old machine is ridiculous.  Down-clocking makes sense
>> because you can adjust to varied levels; but it's difficult and usually
>> infeasible.  Pulling memory and mix and matching is not much better.
>>
>> On Linux we have mem= to toy with memory, which I personally HAVE used
>> to evaluate how various distributions and releases of GNOME operate
>> under memory pressure.  This is a lot more convenient than pulling chips
>> and trying to find the right combination.  This option was, apparently,
>> designed for situations where actual system memory capacity is
>> mis-detected (mandrake 7.2 and its insistence that a 256M memory stick
>> is 255M....); but is very useful in this application too.
>> [...]
>>  
>>
> An easier way might be to use a system emulator like Qemu.
> You can specify the amount of memory the emulated system has,
> and if you do not use the kernel accelerating module (kqemu)
> it slows down considerably.
> 

Yes but it slows down to like a 25MHz system :)

> Of course, it would be nicer if you could actually specify performance
> levels and an issue with this approach is that it does not uniformly
> scale down performance: I think IO emulation performance is a lot worse
> then CPU emulation performance (in Qemu).

Yep.

> 
> With friendly regards,
> Takis
> 
> 

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