lkml.org 
[lkml]   [2005]   [Oct]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 00/07][RFC] i386: NUMA emulation
On 10/3/05, David Lang <david.lang@digitalinsight.com> wrote:
> On Mon, 3 Oct 2005, Magnus Damm wrote:
>
> > On 10/1/05, Dave Hansen <haveblue@us.ibm.com> wrote:
> >> On Fri, 2005-09-30 at 16:33 +0900, Magnus Damm wrote:
> >>> These patches implement NUMA memory node emulation for regular i386 PC:s.
> >>>
> >>> NUMA emulation could be used to provide coarse-grained memory resource control
> >>> using CPUSETS. Another use is as a test environment for NUMA memory code or
> >>> CPUSETS using an i386 emulator such as QEMU.
> >>
> >> This patch set basically allows the "NUMA depends on SMP" dependency to
> >> be removed. I'm not sure this is the right approach. There will likely
> >> never be a real-world NUMA system without SMP. So, this set would seem
> >> to include some increased (#ifdef) complexity for supporting SMP && !
> >> NUMA, which will likely never happen in the real world.
> >
> > Yes, this patch set removes "NUMA depends on SMP". It also adds some
> > simple NUMA emulation code too, but I am sure you are aware of that!
> > =)
> >
> > I agree that it is very unlikely to find a single-processor NUMA
> > system in the real world. So yes, "[PATCH 02/07] i386: numa on
> > non-smp" adds _some_ extra complexity. But because SMP is set when
> > supporting more than one cpu, and NUMA is set when supporting more
> > than one memory node, I see no reason why they should be dependent on
> > each other. Except that they depend on each other today and breaking
> > them loose will increase complexity a bit.
>
> hmm, observation from the peanut gallery, would it make sene to look at
> useing the NUMA code on single proc machines that use PAE to access more
> then 4G or ram on a 32 bit system?

Hm, maybe? =) What would you like to accomplish by that?

/ magnus
-
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: 2005-10-03 12:04    [W:0.088 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site