Douglas, On Wed, Jul 25, 2007 at 07:14:27AM -0700, Douglas Nordwall wrote: > I realize that this is probably a bit of an odd place to ask this, > but I've not been able to find much reference to it anywhere else. > Does anyone know if the performance counters on Opterons (which ever > flavor) and Core 2 Duos are per socket (i.e. there are 4 on the > physical package that gets shipped to me) or 4 per core (meaning a > total of 16 on a quad core processor)? I've been working on getting > perfmon and kernel patches compiled so I can figure this out, but due > to a strange set of circumstances, hadn't gotten anything working > until yesterday.
All counters are per core. Now, on the AMD Opterons, if you measure certain northbridge-related events, then you have to ensure that only one of the cores of a socket measures this kind of event. This is simply because the source of the information is shared by all cores on a socket. -- -Stephane _______________________________________________ perfmon mailing list [email protected] http://www.hpl.hp.com/hosted/linux/mail-archives/perfmon/
