Re: TLB entries > 4kb

David Woodhouse (Dave@imladris.demon.co.uk)
Thu, 12 Feb 1998 21:52:19 +0000

mingo@chiara.csoma.elte.hu said:
> On Thu, 12 Feb 1998, Alan Cox wrote:
> > 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 ...

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alan@lxorguk.ukuu.org.uk said:
> The way its done is ok normally. I guess you need to make X over
> Linux/RT call the rtlinux kernel to handle it. Note X _has_ to do
> those global cli/sti's to meet hardware needs

---------------

GGI (well, KGI) should be able to fix both of these, shouldn't it?

---- ---- ----
David Woodhouse, Robinson College, CB3 9AN, England. (+44) 0976 658355
Dave@imladris.demon.co.uk http://dwmw2.robinson.cam.ac.uk
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