From: Mark Lord <mlord@pobox.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Jens Axboe <axboe@suse.de>, Linus Torvalds <torvalds@osdl.org>,
Byron Stanoszek <gandalf@winds.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: 2G memory split
Date: Tue, 10 Jan 2006 13:58:02 -0500 [thread overview]
Message-ID: <43C403BA.1050106@pobox.com> (raw)
In-Reply-To: <43C3F0CA.10205@rtr.ca>
Mark Lord wrote:
..
> +choice
> + depends on EXPERIMENTAL && !X86_PAE
> + prompt "Memory split"
> + default VMSPLIT_3G
> + help
> + Select the desired split between kernel and user memory.
> +
> + If the address range available to the kernel is less than the
> + physical memory installed, the remaining memory will be available
> + as "high memory". Accessing high memory is a little more costly
> + than low memory, as it needs to be mapped into the kernel first.
> + Note that increasing the kernel address space limits the range
> + available to user programs, making the address space there
> + tighter. Selecting anything other than the default 3G/1G split
> + will also likely make your kernel incompatible with binary-only
> + kernel modules.
> +
> + If you are not absolutely sure what you are doing, leave this
> + option alone!
> +
> + config VMSPLIT_3G
> + bool "3G/1G user/kernel split"
> + config VMSPLIT_3G_OPT
> + bool "3G/1G user/kernel split (for full 1G low memory)"
> + config VMSPLIT_2G
> + bool "2G/2G user/kernel split"
> + config VMSPLIT_1G
> + bool "1G/3G user/kernel split"
> +endchoice
> +
> +config PAGE_OFFSET
> + hex
> + default 0xC0000000
> + default 0xB0000000 if VMSPLIT_3G_OPT
> + default 0x78000000 if VMSPLIT_2G
> + default 0x40000000 if VMSPLIT_1G
> +
...
> #ifdef __ASSEMBLY__
> -#define __PAGE_OFFSET (0xC0000000)
> +#define __PAGE_OFFSET CONFIG_PAGE_OFFSET
> #define __PHYSICAL_START CONFIG_PHYSICAL_START
> #else
> -#define __PAGE_OFFSET (0xC0000000UL)
> +#define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
> #define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
> #endif
> #define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
Mmm.. somethings wrong with this version..
I have selected VMSPLIT_2G, but on rebooting the kernel
now only sees/uses 1GB of RAM (the machine has 2GB of RAM).
Almost as if those trailing "if VMSPLIT_" clauses are being ignored.
--
Mark Lord
Real-Time Remedies Inc.
mlord@pobox.com
next prev parent reply other threads:[~2006-01-10 18:58 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 12:58 2G memory split Jens Axboe
2006-01-10 13:29 ` Ingo Molnar
2006-01-10 13:37 ` Jens Axboe
2006-01-10 13:43 ` Byron Stanoszek
2006-01-10 13:47 ` Jens Axboe
2006-01-10 14:39 ` Jens Axboe
2006-01-10 14:44 ` Ingo Molnar
2006-01-10 15:03 ` [PATCH] Address space split configuration Jens Axboe
2006-01-10 15:11 ` Mark Lord
2006-01-10 15:24 ` Mikael Pettersson
2006-01-10 16:14 ` 2G memory split Linus Torvalds
2006-01-10 16:40 ` Mark Lord
2006-01-10 16:52 ` Linus Torvalds
2006-01-10 18:33 ` Coywolf Qi Hunt
2006-01-10 17:07 ` Mark Lord
2006-01-10 17:28 ` Linus Torvalds
2006-01-10 17:32 ` Jens Axboe
2006-01-10 17:37 ` Mark Lord
2006-01-10 18:58 ` Mark Lord [this message]
2006-01-10 19:16 ` [PATCH ] VMSPLIT config options (with default config fixed) Mark Lord
2006-01-10 17:37 ` Jeff V. Merkey
2006-01-10 19:27 ` Jens Axboe
2006-01-11 1:13 ` J.A. Magallon
2006-01-11 10:15 ` Jens Axboe
2006-01-11 16:00 ` Greg Norris
2006-01-11 17:13 ` Mark Lord
2006-01-11 17:44 ` Greg Norris
2006-02-05 18:42 ` Barry K. Nathan
2006-02-01 22:23 ` Herbert Poetzl
2006-02-02 11:04 ` Ulrich Mueller
2006-02-02 20:55 ` Jan Engelhardt
2006-02-03 22:39 ` Mark Lord
2006-02-04 10:23 ` Ulrich Mueller
2006-02-04 11:06 ` Jan Engelhardt
2006-02-04 10:36 ` Jens Axboe
2006-02-04 11:05 ` Jan Engelhardt
2006-02-04 13:57 ` Mark Lord
2006-02-05 15:32 ` J.A. Magallon
2006-02-05 15:38 ` Arjan van de Ven
2006-02-05 21:14 ` Jan Engelhardt
2006-02-05 21:19 ` Arjan van de Ven
2006-02-06 14:56 ` Jan Engelhardt
2006-02-07 0:41 ` Herbert Poetzl
2006-02-07 2:51 ` Mark Rustad
2006-02-07 9:38 ` Bernd Petrovitsch
2006-02-07 12:19 ` RFC: add an ADVANCED_USER option Adrian Bunk
2006-02-07 14:05 ` Ulrich Mueller
2006-02-07 14:42 ` Adrian Bunk
2006-02-09 16:06 ` Jan Engelhardt
2006-01-10 17:48 ` 2G memory split Bernd Eckenfels
2006-01-10 16:30 ` [PATCH] " Jeff V. Merkey
2006-01-10 18:50 ` Lennart Sorensen
2006-01-10 17:13 ` Jeff V. Merkey
2006-01-10 19:42 ` Jens Axboe
2006-01-10 20:17 ` Bernd Eckenfels
2006-01-10 20:28 ` Jens Axboe
2006-01-11 8:39 ` Bernd Eckenfels
2006-01-11 10:06 ` Jens Axboe
2006-01-10 18:14 ` Martin Bligh
2006-01-10 18:34 ` Linus Torvalds
2006-01-10 16:56 ` Jeff V. Merkey
2006-01-10 17:01 ` Jeff V. Merkey
2006-01-10 18:45 ` Mark Lord
2006-01-10 18:46 ` Martin Bligh
2006-01-10 18:58 ` Jens Axboe
2006-01-10 17:17 ` Jeff V. Merkey
2006-01-10 20:55 ` Alan Cox
2006-01-10 19:12 ` Jeff V. Merkey
2006-01-10 21:02 ` Jens Axboe
2006-01-10 19:30 ` Jeff V. Merkey
2006-01-10 18:39 ` Martin Bligh
2006-01-10 18:55 ` Dave Hansen
2006-01-10 19:01 ` Mark Lord
2006-01-10 19:05 ` Dave Hansen
2006-01-10 17:07 ` Sergey Vlasov
2006-04-10 14:11 ` Kirill Korotaev
2006-04-10 14:39 ` Mark Lord
2006-01-10 18:28 ` Coywolf Qi Hunt
2006-01-10 13:47 ` Mikael Pettersson
2006-01-10 13:54 ` Jens Axboe
2006-01-10 14:09 ` Gerd Hoffmann
2006-01-10 14:21 ` Jens Axboe
2006-01-10 14:25 ` Jens Axboe
2006-01-10 20:42 ` Jan Engelhardt
2006-01-11 0:25 ` Con Kolivas
2006-01-10 14:12 ` Mark Lord
2006-01-10 14:22 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=43C403BA.1050106@pobox.com \
--to=mlord@pobox.com \
--cc=akpm@osdl.org \
--cc=axboe@suse.de \
--cc=gandalf@winds.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=torvalds@osdl.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).