HyperThreading and CPU topologies.

[Marcel Moolenaar]

On Thu, Jun 12, 2003 at 01:45:52PM +0200, Poul-Henning Kamp wrote:
> In message <20030612051553.J36168-100000 at mail.chesapeake.net>, Jeff Roberson wr
> ites:
> >Index: smp.h
> >===================================================================
> >RCS file: /home/ncvs/src/sys/sys/smp.h,v
> >retrieving revision 1.72
> >diff -r1.72 smp.h
> >19a20,46
> >>
> >> /*
> >>  * Topology of a NUMA or HTT system.
> >>  *
> >>  * The top level topology is an array of pointers to groups.  Each group
> >>  * contains a bitmask of cpus in its group or subgroups.  It may also
> >>  * contain a pointer to an array of child groups.
> >>  *
> >>  * The bitmasks at non leaf groups may be used by consumers who support
> >>  * a smaller depth than the hardware provides.
> >>  *
> >>  * The topology may be omitted by systems where all CPUs are equal.
> >>  */
> >>
> >> struct cpu_group {
> >>       int     cg_mask;                /* Mask of cpus in this group. */
> 
> u_int ?
> 
> uint32_t ?

It's best to make it MD depedendent. I prefer 64-bit masks in ia64.

-- 
 Marcel Moolenaar	  USPA: A-39004		 marcel at xcllnt.net