HP-UX Virtual Partitions Administrator Guide (includes A.05.08) (5900-1312, March 2011)

• Memory is allocated in multiples of granule size.
• On cellular systems that have System Firmware (SFW) version 6.xx or later installed, a
non-optimal memory configuration may result in CLM memory in the vPars available memory,
even though CLM is not configured. This is new behavior, and must not be considered an
error. This behavior occurs because the firmware returns a portion of the memory reserved
for the firmware back to the operating system as CLM.
CPU: Topics
The CPU topics in this section are:
• “CPU: Concepts and Functionality” (page 191)
• Assigning (Adding) Or Deleting CPUs
“CPU: Specifying Min and Max Limits” (page 192)◦
◦ “CPU: Adding and Deleting by Total” (page 192)
◦ “CPU: Adding or Deleting by CLP (Cell Local Processor)” (page 194)
◦ “CPU: Adding or Deleting by Hardware Path” (page 195)
◦ “Memory, CPU: Canceling Pending Operations” (page 201)
• “CPU: Notes on vPars Syntax, Rules, and Output” (page 195)
• Additional CPU Topics
“CPU: Dual-Core Processors” (page 196)◦
◦ “CPU: Hyperthreading ON/OFF (HT ON/OFF)” (page 198)
◦ “CPUs: Managing I/O Interrupts” (page 199)
◦ “CPU: CPU Monitor (Formerly Known As LPMC Monitor)” (page 200)
CPU: Concepts and Functionality
NOTE:
Processor Terminology
Processing resources under vPars, both as input arguments and command outputs, are described
as “CPUs.” For multi-core processors such as the PA-8800 and dual-core Intel Itanium processors,
the term “CPU” is synonymous with “core.” The term “processor” refers to the hardware component
that plugs into a processor socket. Therefore a single processor can have more than one core, and
vPars commands will refer to the separate cores as distinct “CPUs,” each with its own hardware
path.
Two vPars terms pre-date multi-core processors, so they are exceptions to this terminology:
• “Boot processor,” which refers to the CPU (that is, core) on which the OS kernel of the virtual
partition was booted.
• “Cell local processor (CLP),” which refers to a CPU on a specified cell.
For more information on dual-core processors, see “CPU: Dual-Core Processors” (page 196).
CPUs: Definitions for CPUs
Beginning with vPars A.04.01, the concept and restrictions of bound and unbound CPUs have
been removed. Now, there are two types of CPUs: boot processors and dynamic CPUs.
Boot Processor This is the CPU on which the OS kernel of the virtual partition was booted.
There is one boot processor per virtual partition. On booting of a virtual
partition, the vPars Monitor determines which CPU becomes the boot
CPU: Topics 191