From: Daniel Walton <dwalton+mips@ddtsm.com>
To: linux-mips@linux-mips.org
Subject: Re: Using more than 256 MB of memory on SB1250 in 32-bit mode
Date: Thu, 20 May 2004 16:27:04 -0400 [thread overview]
Message-ID: <20040520202703.GA24477@ddtsm.com> (raw)
In-Reply-To: <20030831133434.GA23189@linux-mips.org>
On Sun, Aug 31, 2003 at 03:34:34PM +0200, Ralf Baechle wrote:
> The explanation you gave isn't exactly right. A 2GB/2GB split would normally
> support 2GB of low memory. We don't on MIPS due to the very inconvenient and
> unchangable mappings of KSEG0/KSEG1 - something that may have been sweet
> in '85 when the address map was designed but not today when 32-bit address
> spaces are beginning to be fairly tight.
>
> Highmem works ok in 2.4 as long as you have a reasonably low ratio of
> highmem to lowmem. For typical loads that means going beyond 4:1 isn't
> sensible but the actual number may vary much based on exact system
> configuration or workload.
>
> Ralf
>
So what is a practical limit to total memory.
Daniel
next prev parent reply other threads:[~2004-05-20 20:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-29 21:59 Using more than 256 MB of memory on SB1250 in 32-bit mode Steve Madsen
2003-08-31 13:34 ` Ralf Baechle
2004-05-20 20:27 ` Daniel Walton [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-08-30 2:40 Finney, Steve
2003-08-30 2:40 ` Finney, Steve
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