From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Allocating more than 890MB in the kernel?
Date: 19 Oct 2001 12:59:20 -0700 [thread overview]
Message-ID: <9qq0mo$eun$1@cesium.transmeta.com> (raw)
In-Reply-To: <Pine.LNX.4.30.0110191204210.21846-100000@hill.cs.ucr.edu> <3BD08207.7090807@interactivesi.com>
Followup to: <3BD08207.7090807@interactivesi.com>
By author: Timur Tabi <ttabi@interactivesi.com>
In newsgroup: linux.dev.kernel
>
> > Isn't this solved by just recompiling the kernel with HIGHMEM support?
>
>
> I don't think so. The Red Hat 7.1 kernel is compiled with "4GB" support,
> which apparently is the same as HIGHMEM. We see the 890MB kernel vmalloc
> limit still.
>
That's because you're running out of address space, not memory.
HIGHMEM doesn't do anything for the latter -- it can't. You start
running into a lot of fundamental problems when your memory size gets
in the same (or higher) ballpark than your address space.
The best solution is go buy a 64-bit CPU. There isn't much else you
can do about it.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
next prev parent reply other threads:[~2001-10-19 19:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-19 18:48 Allocating more than 890MB in the kernel? Timur Tabi
2001-10-19 19:04 ` John Tyner
2001-10-19 19:41 ` Timur Tabi
2001-10-19 19:59 ` H. Peter Anvin [this message]
2001-10-19 20:21 ` Timur Tabi
2001-10-19 20:32 ` H. Peter Anvin
2001-10-20 4:40 ` Rob Landley
2001-10-20 18:09 ` H. Peter Anvin
2001-10-25 4:04 ` Albert D. Cahalan
2001-10-26 16:13 ` Timur Tabi
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