lkml.org 
[lkml]   [2003]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: experiences beyond 4 GB RAM with 2.4.22
On Tue, 16 Sep 2003 11:49:10 -0400
Timothy Miller <miller@techsource.com> wrote:

> Alan Cox wrote:
> > The kernel has no idea what you will do with given ram. It does try to
> > make some guesses but you are basically trying to paper over hardware
> > limits.
>
>
> Maybe not what you WILL DO, but what you HAVE DONE. Those tasks which
> have done the most DMA-requiring I/O could get preference for low
> memory. No?
>
> Yeah, I know.. show you the code. :)

That really sounds complex and therefore I would not try that in first place.
And it does not sound like a solution to my special problem of few tasks
operating on a lot of data (a lot more than fits to physical mem). For this
type of situation it would be really intelligent not to give away non-dma-able
memory. How can the kernel do that?
At least it knows that there are I/O devices that cannot cope with the mem it
is presenting. This sounds in fact simple.
The problem is: what _can_ be done with this type of mem at all?
It does not even help a lot if there are other devices that can handle it,
because you still must face the fact of a simple file-copy from such a capable
device to one that is not.
No wonder that the gurus did not have any good idea yet ;-)

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

\
 
 \ /
  Last update: 2005-03-22 13:48    [W:0.135 / U:0.760 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site