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Re: TLB entries > 4kb

To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: TLB entries > 4kb
From: MOLNAR Ingo <mingo@chiara.csoma.elte.hu>
Date: Thu, 12 Feb 1998 19:00:41 +0100 (CET)
Cc: ralf@uni-koblenz.de, linux-kernel@vger.rutgers.edu, linux@cthulhu.engr.sgi.com
In-reply-to: <m0y2uMG-0005FsC@lightning.swansea.linux.org.uk>
Sender: owner-linux@cthulhu.engr.sgi.com
On Thu, 12 Feb 1998, Alan Cox wrote:

> > Has anybody ever looked into implementing that?  What architectures besides
> > MIPS could take advantage of such a feature?
> 
> On the intel its a huge win to map PCI frame buffers using 4Mbyte pages, but
> the kernel mmap really can't hack the idea right now. A pity cos if you
> hack it in and make sure you never unmap it you get 2-3% better X performance

i tried to hack this half a year ago, but had to find out that 4MB pages
are only valid for kernel mappings, which means we'd have to make X a ring
0 process too ...

-- mingo


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