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
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