irqbalance man page on ElementaryOS

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IRQBALANCE(1)			  irqbalance			 IRQBALANCE(1)

NAME
       irqbalance - distribute hardware interrupts across processors on a mul‐
       tiprocessor system

SYNOPSIS
       irqbalance

DESCRIPTION
       The purpose of irqbalance is distribute hardware interrupts across pro‐
       cessors on a multiprocessor system in order to increase performance.

OPTIONS
       --oneshot
	      Causes irqbalance to be run once, after which the daemon exits

       --debug
	      Causes  irqbalance  to  print  extra debug information.  Implies
	      --foreground

       --foreground
	      Causes irqbalance to run in the foreground (without --debug)

       --hintpolicy=[exact | subset | ignore]
	      Set the policy for how irq kernel affinity hinting  is  treated.
	      Can be one of:

       exact irq affinity hint is applied unilaterally and never violated

       subset irq is balanced, but the assigned object will be a subset of the
       affintiy hint

       ignore irq affinity hint value is completely ignored

       --powerthresh=<threshold>
	      Set the threshold at which we attempt to move a cpu into	power‐
	      save mode If more than <threshold> cpus are more than 1 standard
	      deviation below the average cpu softirq workload,	 and  no  cpus
	      are  more	 than 1 standard deviation above (and have more than 1
	      irq assigned to them), attempt to place 1 cpu in powersave mode.
	      In  powersave mode, a cpu will not have any irqs balanced to it,
	      in an effort to prevent that cpu from waking up without need.

       --banirq=<irqnum>
	      Add the specified irq to the set of banned irqs. irqbalance will
	      not affect the affinity of any irqs on the banned list, allowing
	      them to be specified manually.  This option is addative and  can
	      be  specified  multiple times. For example to ban irqs 43 and 44
	      from balancing,  use  the	 following  command  line:  irqbalance
	      --banirq=43 --banirq=44

       --policyscript=<script>
	      When specified, the referenced script will execute once for each
	      discovered irq, with the sysfs device path and irq number passed
	      as  arguments.   The  script  may specify zero or more key=value
	      pairs that will guide irqbalance in the management of that  irq.
	      Key=value	 pairs are printed by the script on stdout and will be
	      captured and interpreted by irqbalance.	Irqbalance  expects  a
	      zero  exit code from the provided utility.  Recognized key=value
	      pairs are:

       ban=[true | false]

       Directs irqbalance to exclude the passed in irq from balancing

       balance_level=[none | package | cache | core]
	      This allows a user to override the balance level of a given irq.
	      By  default  the balance level is determined automatically based
	      on the pci device class of the device that owns the irq.

       numa_node=<integer>
	      This allows a user to override the numa node  that  sysfs	 indi‐
	      cates  a	given device irq is local to.  Often, systems will not
	      specify this information in ACPI, and as a result	 devicesa  are
	      considered  equidistant  from  all numa nodes in a system.  This
	      option allows for that hardware provided information to be over‐
	      ridden,  so  that	 irqbalance  can  bias	irq affinity for these
	      devices toward its most local node.  Note that specifying	 a  -1
	      here forces irqbalance to consider an interrupt from a device to
	      be equidistant from all nodes.

       --pid=<file>
	      Have irqbalance write its process id to the specified file.   By
	      default no pidfile is written.  The written pidfile is automati‐
	      cally unlinked when irqbalance exits.

ENVIRONMENT VARIABLES
       IRQBALANCE_ONESHOT
	      Same as --oneshot

       IRQBALANCE_DEBUG
	      Same as --debug

       IRQBALANCE_BANNED_CPUS
	      Provides a mask of cpus which irqbalance should ignore and never
	      assign interrupts to

SIGNALS
       SIGHUP Forces a rescan of the available irqs and system topology

Homepage
       http://code.google.com/p/irqbalance

Linux				   Dec 2006			 IRQBALANCE(1)
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