Message-ID: <479F6C6B.7090505@rtr.ca>
Date: Tue, 29 Jan 2008 13:11:55 -0500
From: Mark Lord <liml@rtr.ca>
Organization: Real-Time Remedies Inc.
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To: rgheck <rgheck@bobjweil.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Daniel Barkalow <barkalow@iabervon.org>,
       Gene Heskett <gene.heskett@gmail.com>, Zan Lynx <zlynx@acm.org>,
       Calvin Walton <calvin.walton@gmail.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Linux ide Mailing list <linux-ide@vger.kernel.org>
Subject: Re: Problem with ata layer in 2.6.24
References: <200801272122.21823.gene.heskett@gmail.com>	<1201539043.31293.7.camel@zem>	<1201540830.6526.19.camel@localhost>	<200801281230.32910.gene.heskett@gmail.com>	<alpine.LNX.1.00.0801281248190.13593@iabervon.org>	<479E1D9E.3000900@bobjweil.com> <20080129121201.2f727f5f@core> <479F5D29.1020705@bobjweil.com>
In-Reply-To: <479F5D29.1020705@bobjweil.com>
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rgheck wrote:
> Alan Cox wrote:
>>> not one problem but lots---is sufficiently widespread that a Mini 
>>> HOWTO, say, would be really welcome and, I'm guessing, widely used.
>>>     
>>
>> We don't see very many libata problems at the distro level and they for
>> the most part boil down to
>>
>> - sata_nv with >4GB of RAM, knowing being worked on, no old IDE driver
>> anyway
>>   
> Is this >4GB or >=4GB? I've seen contradictory reports, and I've got 4GB.
..

For all practical purposes, most memory over 3GB (or sometimes even 2GB)
on a 32-bit x86 system is treated as >4GB by the motherboard.

Because it's not the amount of *memory* that matters so much,
but rather the amount of *used address space*.  Video cards,
PCI devices, other motherboard resources etc.. can all subtract
from the available address space, leaving much less than 4GB
for your RAM. 

-ml

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