From: Joseph A Knapka <jknapka@earthlink.net>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ravi K <kravi26@yahoo.com>,
kernelnewbies@nl.linux.org, linux-mm@kvack.org
Subject: Re: Maximum physical memory on i386 platform
Date: Wed, 02 Jan 2002 22:46:04 +0000 [thread overview]
Message-ID: <3C338DAC.EC325F3@earthlink.net> (raw)
In-Reply-To: 3C33B37E.4050604@zytor.com
"H. Peter Anvin" wrote:
>
> Ravi K wrote:
>
> > 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)
>
> 64GB is physical memory, not virtual memory.
And at approx. 64 bytes per strct page in mem_map, that's
1G worth of page structs, which is Ravi's point.
Cheers,
-- Joe
"I should like to close this book by sticking out any part of my neck
which is not yet exposed, and making a few predictions about how the
problem of quantum gravity will in the end be solved."
--- Physicist Lee Smolin, "Three Roads to Quantum Gravity"
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prev parent reply other threads:[~2002-01-02 22:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-02 22:20 Maximum physical memory on i386 platform Ravi K
2002-01-03 1:27 ` H. Peter Anvin
2002-01-02 22:46 ` Joseph A Knapka [this message]
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