11-21-2006
Sprellarinn was almost correct. It all depends on you version of AIX! Version 5.2 then 4 physical and 4 virtual is correct! Plus I would consider running it in a dedicated setup anyway, which means the virtual element does not count anymore! With version 5.3 things changed drastically! The word virtualisation arrived and with it came the ability to have many virtual CPUs on a few physical ones. There is a limit though and it comes down to the 0.1 slice rule and micro-partitioning! Think in terms of 10 to 1 this would mean an LPAR configured with 2 processing units could effectively have the execution time of 20 physical processors.
The best way to work out the virtual configuration is to take into account the amount of physical storage allocated to the machine. If this is high (high tens of Giga Bytes) then the number of virtual CPUs should be kept to a sensible figure otherwise the paging out of shared memory can kill the performance. I would suggest that with 4 CPUs then a virtual setting of 8 to 10 virtual will not be a bad thing. However if your TL is 4 (oslevel -s) then turn off the vmm_mpsize_support with the command:
# vmo -r -o vmm_mpsize_support=0
# bosboot -a
# shutdown -Fr
Hope this helps!
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LEARN ABOUT CENTOS
ipsec_tncfg
IPSEC_TNCFG(8) Executable programs IPSEC_TNCFG(8)
NAME
ipsec_tncfg - manipulate KLIPS virtual interfaces
SYNOPSIS
ipsec tncfg
ipsec tncfg --create virtual
ipsec tncfg --delete virtual
ipsec tncfg --attach --virtual virtual --physical physical
ipsec tncfg --detach --virtual virtual
ipsec tncfg --clear
ipsec tncfg --version
ipsec tncfg --help
KLIPS
Note that tncfg is only supported on the KLIPS stack which uses ipsecX interfaces bound to physical interfaces
DESCRIPTION
The purpose of tncfg is to attach/detach IPsec virtual interfaces (e.g. ipsec0) to/from physical interfaces (e.g. eth0) through which
packets will be forwarded once processed by KLIPS.
When using the MAST stack, tncfg is used to create and delete virtual interfaces known as mastXXX. mast stands for Mooring and XXX.
The form with no additional arguments lists the contents of /proc/net/ipsec_tncfg. The format of /proc/net/ipsec_tncfg is discussed in
ipsec_tncfg(5).
The --attach form attaches the virtual interface to the physical one.
The --detach form detaches the virtual interface from whichever physical interface it is attached to.
The --clear form clears all the virtual interfaces from whichever physical interfaces they were attached to.
Virtual interfaces typically have names like ipsec0 or mast0 while physical interfaces typically have names like eth0 or ppp0.
EXAMPLES
ipsec tncfg --create mast12
creates the mast12 device.
ipsec tncfg --create ipsec4
creates an ipsec4 device, but does not attach it.
ipsec tncfg --attach --virtual ipsec0 --physical eth0
attaches the ipsec0 virtual device to the eth0 physical device.
FILES
/proc/net/ipsec_tncfg, /usr/local/bin/ipsec
SEE ALSO
ipsec(8), ipsec_manual(8), ipsec_eroute(8), ipsec_spi(8), ipsec_spigrp(8), ipsec_klipsdebug(8), ipsec_tncfg(5)
HISTORY
Written for the Linux FreeS/WAN project <http://www.freeswan.org/> by Richard Guy Briggs.
AUTHOR
Paul Wouters
placeholder to suppress warning
libreswan 12/16/2012 IPSEC_TNCFG(8)