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List:       mythtv-users
Subject:    Re: [mythtv-users] i386 vs x86_64 Fedora
From:       Miroslav_Suchý <miroslav () suchy ! cz>
Date:       2008-05-20 19:51:52
Message-ID: 48332BD8.3050303 () suchy ! cz
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Blammo napsal(a):
>> Memory:
>> i386 - can use up to 3.5GB (more with some tricks which limit speed)
>> x86_64 - can use "unlimited" memory
>> *** Probably not affect on MythTV deployment
> 
> Well written overall, one small correction:
> 
> At various jobs, I've had many Opteron based servers running
> RHEL4/5-i386 with more than 4 gigs of RAM, and have had all of it
> usable by the operatiing system. The windows operating system is the
> only one _REALLY_ borked when it comes to handling more than 4gigs of
> ram.

As I said - you can, the trick is PAE [1]. Which means you need to do 
three cpu instruction instead of two, when you access memory. Which 
means 50% descrease of CPU speed with memory access.

Mirek Suchy

[1] http://en.wikipedia.org/wiki/Physical_Address_Extension

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