linux-kernel - Re: Problem with ata layer in 2.6.24

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Date:	Tue, 29 Jan 2008 13:11:55 -0500
From:	Mark Lord <liml@....ca>
To:	rgheck <rgheck@...jweil.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Daniel Barkalow <barkalow@...ervon.org>,
	Gene Heskett <gene.heskett@...il.com>,
	Zan Lynx <zlynx@....org>,
	Calvin Walton <calvin.walton@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux ide Mailing list <linux-ide@...r.kernel.org>
Subject: Re: Problem with ata layer in 2.6.24

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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