From: Scott Wood <scottwood@freescale.com>
To: michael.firth@bt.com
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Maximum ioremap size for ppc arch?
Date: Wed, 05 Dec 2007 11:50:40 -0600 [thread overview]
Message-ID: <4756E4F0.8050906@freescale.com> (raw)
In-Reply-To: <4756E3E8.8090102@freescale.com>
Scott Wood wrote:
> michael.firth@bt.com wrote:
>> This seems to leave only 1GB of addressing space for all the
>> physically addressable memory (RAM + ioremapped + registers), while
>> reserving 3GB of space for user processes. The 3GB is presumably
>> mostly unusable on a system without a large amount of swap, as the
>> 1GB limit on memory will prevent much more than that being available
>> for user space.
>
> Well, it's also useful for sparse mappings, but I agree that the 3/1
> split is probably suboptimal for most workloads.
Oh, and the 3G user is also useful for accessing highmem, of course.
-Scott
prev parent reply other threads:[~2007-12-05 17:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-03 9:22 Maximum ioremap size for ppc arch? michael.firth
2007-12-03 10:20 ` Arnd Bergmann
2007-12-03 15:30 ` Matt Porter
2007-12-03 17:50 ` David Hawkins
2007-12-03 19:07 ` Matt Porter
2007-12-03 19:51 ` David Hawkins
2007-12-05 9:50 ` michael.firth
2007-12-05 17:46 ` Scott Wood
2007-12-05 17:50 ` Scott Wood [this message]
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