lkml.org 
[lkml]   [2002]   [Jan]   [15]   [last100]   RSS Feed
Views: [more markup]   [less markup]   [headers]   [forward]  
 
Messages in this thread
/
DateTue, 15 Jan 2002 16:05:39 -0500
FromBrian Gerst <>
SubjectRe: 3.5G user space speed
Peter Zaitsev wrote:
> 
> Hello Linux,
> 
>   2.4.xaa Series as well as  SuSE kernels have  3.5G userspace option,
>   which seems to be quite useful, therefore I see it's not included
>   is stock kernel for some reasons. Also I've heard this
>   configuration may have some performance problems.
> 
>   Can anyone comment on this topic ?
> 
>   I need large amount of address space for my application but I also
>   need to get as much I/O performance as it's possible, so I can switch
>   to 3.0/1.0 memory distribution if it will benefit here.

You can't have it both ways with the x86 (speed vs. large userspace). 
Kernel 2.5 may help a bit here because changes were made to allow DMA
from all memory (subject to card limitations), lessening the burden for
direct-mapped memory.  Otherwise you'll need to move to a 64-bit arch.

--

				Brian Gerst
-
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 11:18    [W:0.219 / U:0.240 seconds]
©2003-2008 Jasper Spaans