Re: [PATCH] hyper-threading information in /proc/cpuinfo

From: J.A. Magallon (jamagallon@able.es)
Date: Fri Oct 25 2002 - 19:43:20 EST

On 2002.10.26 "Nakajima, Jun" wrote:
>RedHat 8.0 is using
> "Physical processor ID\t:"
> "Number of siblings\t:"
>This implies they need to change it anyway, because 2.4-ac is
> "physical id\t:"
> "siblings\t:"
>

Summary:
- we have processor packages
- each package can handle several (someone said 128+ ;) ) processor cores.
  We really do not mind if they are really independent (power4) or not
  (xeon, ht)
- each core is a logical unit for Linux
- can we have two packages with different number of cores ?

Proposal for /proc/cpuinfo (sample box: an hypothetical TurboPower4 with
4 cores, 2 units on an SMP box):

processor : 0 processor : 2 processor : 4 processor : 6
package : 0 package : 0 package : 0 package : 0
core : 0 core : 1 core : 2 core : 3

processor : 1 processor : 3 processor : 5 processor : 7
package : 1 package : 1 package : 1 package : 1
core : 0 core : 1 core : 2 core : 3

So you can look for siblings based on package number, you can know if
two precessors are in different packages (for sched...), etc.

NOTE: do not know if 'core' name can give problems, perhaps you could use
'unit' instead. 

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.1 (Cooker) for i586
Linux 2.4.20-pre11-jam2 (gcc 3.2 (Mandrake Linux 9.0 3.2-2mdk))
-
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/

This archive was generated by hypermail 2b29 : Thu Oct 31 2002 - 22:00:30 EST