lkml.org 
[lkml]   [1998]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Problem with 1G RAM

On Fri, 4 Dec 1998, David S. Miller wrote:

> From: Perry Harrington <pedward@sun4.apsoft.com>
> Date: Fri, 4 Dec 1998 14:58:51 -0800 (PST)
>
> Does any of this make sense? Or am I just off my rocker? I thought
> of dynamicising PAGE_OFFSET for x86, but I figured that Linus, et
> al, would have a fit over performance.
>
> Look at the BTFIXUP stuff we do on sparc32 to see another idea of how
> to taper off most of the performance problems assosciated with a
> dynamic PAGE_OFFSET. (TASK_UNMAPPED_BASE was a real killer before we
> added the BTFIXUP stuff, it put a divide into a critical path).

the problem with this is that x86 CISC instructions are inherently more
difficult to fix up runtime :(
-- mingo


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:45    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site