HP-UX Virtual Partitions Administrator's Guide (includes A.03.05 and A.04.05)

1/0/12 BUS_BRIDGE sv_model= 10 HPA=0xffffff8110018000 VPAR=vpar1
1/0/14 BUS_BRIDGE sv_model= 10 HPA=0xffffff811001c000 VPAR=NONE
1/5 MEMORY sv_model= 9 HPA=0xfffffffffc096000 VPAR=ALL
1/6 IPMI sv_model=192 HPA=0xfffffffc300c0000 VPAR=ALL
1/10 NPROC sv_model= 4 HPA=0xfffffffffc0f0000 VPAR=vpar1
1/11 NPROC sv_model= 4 HPA=0xfffffffffc0f1000 VPAR=SHARED
1/14 NPROC sv_model= 4 HPA=0xfffffffffc0f8000 VPAR=SHARED
1/15 NPROC sv_model= 4 HPA=0xfffffffffc0f9000 VPAR=SHARED
where the following CPU pairs are siblings:
• CPU 1/10 (owned by vpar1) and CPU 1/11 (unassigned)
• CPU 0/10 (owned by vpar2) and CPU 0/11 (owned by vpar3)
• CPU 0/14 (owned by vpar4) and CPU 0/15 (unassigned)
• CPU 1/14 (unassigned) and CPU 1/15 (unassigned)
CPU: Hyperthreading ON/OFF (HT ON/OFF)
Hyperthreading is a new feature supported in HP-UX 11i v3 (11.31) environments on servers
with the dual core Intel Itanium processors. It provides for executing multiple threads on a single
core. This allows multiple hardware threads to share under-utilized resources, increasing overall
throughput and performance. Throughput increases are typically achieved by making use of the
idle cycles and idle functional units that occur due to memory stalls. For more information on
hyperthreading and performance, see the white paper Dynamic Logical Processors for
Hyper-Threading on HP-UX 11i v3 available at http://docs.hp.com.
Hyperthreading is supported within vPars A.05.xx environments. However, note the following
details.
• HT ON/OFF can be set using any of the following commands.
— The vPar Monitor’s threads command.
The syntax is:
threads [on|off]
For example:
MON> threads
HyperThreading is currently OFF
HyperThreading will be OFF after the next nPar reboot
MON> threads on
HyperThreading is now set to be ON after the next reboot
MON> threads
HyperThreading is currently OFF
HyperThreading will be ON after the next nPar reboot
MON> threads off
HyperThreading is now set to be OFF after the next reboot
— The EFI shell’s cpuconfig command.
The syntax is:
cpuconfig threads [on|off]
For a primer on cpuconfig, see “Setting Hyperthreading (HT ON/OFF) and cpuconfig
Primer” (page 260).
— The HP-UX shell’s parmodify command.
The syntax is:
parmodify -T y|n
— The HP-UX shell’s setboot command.
The syntax is:
202 CPU, Memory, and I/O Resources (A.05.xx)