Chapter 3. Hardware configuration
107
Physical mode
This mode is applicable to XAPIC based systems too. It allows up to 255 physical
agent IDs. Although there is no definition of what has to be considered as a
cluster ID in this mode, the chipset design has imposed a limitation because of
clustering controllers for 16 possible cluster IDs. The physical mode allows up to
15 physical mode agents per cluster.
Linux operating systems
Linux distributions, such as Red Hat and SUSE, require special capabilities to
support clustering beyond the shrink-wrapped flat mode. Future Linux
distributions in general will boot scaled systems in physical mode and therefore
are not affected when booting and POST has set up the topology within the
restrictions of logical mode; logical mode is essentially a subset of physical
mode.
Additionally, Linux distributions in physical mode can possibly support processor
packages with four agents, each beyond the four-chassis limit of logical mode
operating systems, and attain a maximum partition topology of eight chassis
incorporating 128 processor agents. The actual number of processor agents
supported by a particular Linux distribution, depends on the vendor. The
assumption is that the newer IA32E(64T) distributions will support greater than
32 agents.
Windows operating systems
Windows Server does not require a custom hardware abstraction layer (HAL)
because it has been incorporated into 2003 SP1 in order to support scaled
systems. The 32-bit Windows operating systems are typically limited to 32
processor agents, by design. Windows Server 2003 x64 supports a maximum of
60 agents purely in logical mode. A special kind of implementation within the
operating system is required to allow 64 agents, which is implemented in the
64-bit Windows Datacenter editions.
Processor Adjacent Sector Prefetch
When this setting is disabled (the default), the processor fetches only the sector
of the cache line that contains the data currently required by the processor.
When it is enabled the processor fetches both sectors of a cache line when it
requires data that is not currently in its cache.
This change here affects all CPUs.
Note:
Changing the mode in clustering technology from logical to physical
mode is not necessary unless you want to upgrade the system to work with a
Linux distribution in a multinode configuration.
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