[Top] [All Lists]

Re: TLB entries > 4kb

To: MOLNAR Ingo <>
Subject: Re: TLB entries > 4kb
From: David Woodhouse <>
Date: Thu, 12 Feb 1998 21:52:19 +0000
Cc: Alan Cox <>,,,
Sender: 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 ...

--------------- 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
            finger for PGP key.

<Prev in Thread] Current Thread [Next in Thread>