From: William Lee Irwin III <wli@holomorphy.com>
To: Ralf Baechle <ralf@oss.sgi.com>
Cc: "Steven J. Hill" <sjhill@cotw.com>, linux-mips@oss.sgi.com
Subject: Re: What is the maximum physical RAM for a 32bit MIPS core?
Date: Wed, 6 Feb 2002 05:17:33 -0800 [thread overview]
Message-ID: <20020206131733.GF744@holomorphy.com> (raw)
In-Reply-To: <20020206033346.A7298@dea.linux-mips.net>
On Tue, Feb 05, 2002 at 10:50:20AM -0600, Steven J. Hill wrote:
>> I am just trying to fill in some more MIPS knowledge here. With a 32-bit
>> MIPS processor, we are forever limited to a userspace of 2GB in size thanks
>> to the kuser region. kseg0/1 map the same 512MB of physical memory. kseg2
>> is 1GB in size and hence it could address another 1GB of RAM. So, is the
On Wed, Feb 06, 2002 at 03:33:46AM +0100, Ralf Baechle wrote:
> 2gb virtual memory per process. In theory physical memory is limited by
> the size of the address bus with highmem; the practical limit for highmem
> should be in the range of 16-32gb RAM.
I'm aware that some of those issues have to do with boot-time allocations
proportional to memory size filling the direct-mapped portion of the kernel
virtual address space. Do you have in mind others? I'm just generally
curious.
Thanks,
Bill
prev parent reply other threads:[~2002-02-06 13:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-05 16:50 What is the maximum physical RAM for a 32bit MIPS core? Steven J. Hill
2002-02-05 17:47 ` Hartvig Ekner
2002-02-05 20:46 ` Steven J. Hill
2002-02-05 20:53 ` Hartvig Ekner
2002-02-05 20:53 ` Hartvig Ekner
2002-02-05 21:15 ` Pete Popov
2002-02-05 21:24 ` Steven J. Hill
2002-02-05 21:44 ` Pete Popov
2002-02-05 21:58 ` Bradley D. LaRonde
2002-02-05 21:58 ` Bradley D. LaRonde
2002-02-06 8:49 ` Geert Uytterhoeven
2002-02-06 11:16 ` nick
2002-02-06 12:07 ` Geert Uytterhoeven
2002-02-06 14:14 ` Bradley D. LaRonde
2002-02-06 14:14 ` Bradley D. LaRonde
2002-02-06 5:29 ` Ralf Baechle
2002-02-06 2:33 ` Ralf Baechle
2002-02-06 13:17 ` William Lee Irwin III [this message]
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