HP-UX 11i Version 2 Release Notes (October 2003)

General System Administration
Interrupt Migration
Chapter 4
88
The changes in VxVM 3.1 (delivered in HP-UX 11i v1.6) to 3.5 (delivered in this release),
most notably the use of static versus dynamic major numbers, means that systems using
VxVM 3.1 on HP-UX 11i v1.6 cannot be installed or recovered using Ignite-UX version
B.5.0. If you are using VxVM on HP-UX 11i v1.6 you should not upgrade Ignite-UX past
version B.4.4. For further information on VxVM, see “VERITAS Volume Manager
(VxVM) 3.5” on page 119.
Performance
There are no performance issues.
Documentation
The instl_adm (4) manpage has been updated accordingly.
The Ignite-UX Administration Guide, B2355-90788, Edition 13 and later, has been
updated to reflect all changes to the product and can be found at
http://www.docs.hp.com/.
Ignite-UX product information and documentation is available at:
http://www.software.hp.com/products/IUX/
Obsolescence
Not applicable.
Interrupt Migration
The Interrupt Migration feature is part of HP-UX 11i v2 core. Interrupt Migration can
be used to view and modify the interrupt configuration of the system.
The intended users of Interrupt Migration are system performance-tuning experts who
need to manage the interrupt distribution of the system.
Interrupts from interface cards can be either line-based (LBI) or transaction-based (TBI)
interrupts. If a processor receives an interrupt when the processor’s interrupt pin is
asserted, that interrupt is line-based. If a processor detects an interrupt message bus
transaction on the system bus, that interrupt is transaction-based.
The intctl command provides options to display the interrupt configuration of the
system, migrate external I/O interrupts from one processor to another, and to save and
restore the interrupt configuration of the system. The intctl command can be used by
performance tuning experts to re-distribute the interrupt load across the CPUs and to
assign interrupts of Real Time Extension (RTE)-reserved cards to RTE-reserved CPUs.
The intctl command is not a general system administration command. It should be
used only by performance-tuning experts with an advanced level of system knowledge.
Improper re-distribution of interrupts across CPUs could decrease overall system
performance by overloading some processors and not optimally using the remaining
processors.