From: Pavel Machek <pavel@ucw.cz>
To: Andrew Morton <akpm@osdl.org>
Cc: William Lee Irwin III <wli@holomorphy.com>, linux-kernel@vger.kernel.org
Subject: Re: mem=16MB laptop testing
Date: Wed, 15 Oct 2003 14:12:08 +0200 [thread overview]
Message-ID: <20031015121208.GA692@elf.ucw.cz> (raw)
In-Reply-To: <20031014045614.22ea9c4b.akpm@osdl.org>
Hi!
> > (c) mem= no longer bounds the highest physical address, but rather
> > the sum of memory in e820 entries post-sanitization. This
> > means a ZONE_NORMAL with about 384KB showed up, with duly
> > perverse heuristic consequences for page_alloc.c
>
> I don't understand this. You mean almost all memory was in ZONE_DMA?
>
> "mem=" does not accurately emulate having that much memory. So a 512M box
> booted with "mem=256M" has a different amount of memory from a 256M box
> booted with no "mem=" option. It would be nice to fix that, but I've never
> looked into it.
I do not think this wants to be fixed. It should remain compatible
with 2.4.X, and if it is not that's a bug [and pretty dangerous & hard
to debug one -- if you mark something as ram which is not, you get
real bad data corruption].
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
next prev parent reply other threads:[~2003-10-15 12:12 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-14 10:55 mem=16MB laptop testing William Lee Irwin III
2003-10-14 11:01 ` John Bradford
2003-10-14 11:08 ` William Lee Irwin III
2003-10-14 13:20 ` John Bradford
2003-10-14 11:56 ` Andrew Morton
2003-10-14 11:58 ` Russell King
2003-10-14 12:10 ` Andrew Morton
2003-10-14 12:18 ` Russell King
2003-10-14 12:30 ` Andrew Morton
2003-10-14 12:17 ` Anton Blanchard
2003-10-14 12:31 ` Andrew Morton
2003-10-14 12:44 ` Anton Blanchard
2003-10-14 23:40 ` Andrew Morton
2003-10-15 13:32 ` Martin Waitz
2003-10-15 17:34 ` Andrew Morton
2003-10-14 12:28 ` William Lee Irwin III
2003-10-15 12:12 ` Pavel Machek [this message]
2003-10-15 12:51 ` William Lee Irwin III
2003-10-15 13:20 ` Pavel Machek
2003-10-15 13:28 ` William Lee Irwin III
2003-10-15 13:59 ` Larry Sendlosky
2003-10-15 15:34 ` Dave Jones
2003-10-15 15:38 ` Thomas Schlichter
2003-10-15 16:06 ` Dave Jones
2003-10-15 17:45 ` Mike Dresser
2003-10-15 15:32 ` Dave Jones
2003-10-15 17:20 ` Andrew Morton
2003-10-15 0:35 ` Nick Piggin
2003-10-15 4:31 ` Andrew Morton
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=20031015121208.GA692@elf.ucw.cz \
--to=pavel@ucw.cz \
--cc=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--cc=wli@holomorphy.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.