From: Ravi K <kravi26@yahoo.com>
To: kernelnewbies@nl.linux.org
Cc: linux-mm@kvack.org
Subject: Maximum physical memory on i386 platform
Date: Wed, 2 Jan 2002 14:20:26 -0800 (PST) [thread overview]
Message-ID: <20020102222026.69416.qmail@web12304.mail.yahoo.com> (raw)
Hi,
The configuration help for HIGHMEM feature on i386
platform states that 'Linux can use up to 64 Gigabytes
of physical memory on x86 systems'. I see a problem
with this:
- page structures needed to support 64GB would take
up 1GB memory (64 bytes per page of size 4k)
- but the kernel can only use 896MB memory, unless
PAGE_OFFSET is changed to a lower value
- enabling 64GB support does not automatically change
the value of PAGE_OFFSET
So how are the page structures created if a machine
has 64GB memory? Or is it necessary to change
PAGE_OFFSET (to 0x80000000) in such a configuration?
Thanks,
Ravi.
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next reply other threads:[~2002-01-02 22:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-02 22:20 Ravi K [this message]
2002-01-03 1:27 ` H. Peter Anvin
2002-01-02 22:46 ` Joseph A Knapka
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