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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 list 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

       --banscript=<script>
	      Execute  the  specified  script for each irq that is discovered,
	      passing the sysfs path to the associated	device	as  the	 first
	      argument,	 and the irq vector as the second.  An exit value of 0
	      tells irqbalance that this interrupt should balanced and managed
	      as  a  normal irq, while a non-zero exit code indicates this irq
	      should be ignored by irqbalance completely (see --banirq above).
	      Use  of  this  script  provides users the ability to dynamically
	      select which irqs get exluded from balancing,  and  provides  an
	      opportunity  for	manual	affinity  setting  in  one single code
	      point.

       --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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