Steve Isaacs wrote:
When I look at the options passed to the compiler on the command line I see the following:
-DCONFIG_MAX_CPUS='4' -DCONFIG_MAX_PHYSICAL_CPUS='2' -DCONFIG_LOGICAL_CPUS='1'
Can someone help me understand what the difference between these is? I'm working with two dual core opterons and this doesn't seem right to me.
Steve
CONFIG_MAX_CPUS : Saves space in the ACPI tables and additional stack space for maximum possible number of cores in the system. Might be better named as CONFIG_MAX_CPUs_CORES (AMD only)
CONFIG_MAX_PHYSICAL_CPUS: Used to set memory SPD addresses and in coherent HyperTransport initialization (AMD only)
CONFIG_LOGICAL_CPUS : This is the flag to build in multi-core support. Similar to CONFIG_MAX_CPUS but only set to 0 or 1. (Used by AMD and Intel code)
Your setup: CONFIG_MAX_CPUS : 4 - 4 cores CONFIG_MAX_PHYSICAL_CPUS: 2 - 2 CPUs CONFIG_LOGICAL_CPUS : 1 - build multi core support in.
Marc