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IRQBALANCE(1)				    irqbalance				    IRQBALANCE(1)

NAME
       irqbalance - distribute hardware interrupts across processors on a multiprocessor system

SYNOPSIS
       irqbalance

DESCRIPTION
       The  purpose of irqbalance is distribute hardware interrupts across processors on a multi-
       processor system in order to increase performance.

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

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

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

       -h, --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

       The default value for hintpolicy is ignore

       -p, --powerthresh=<threshold>
	      Set the threshold at which we attempt to move a cpu into	powersave  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  pre-
	      vent that cpu from waking up without need.

       -i, --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

       -l, --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  cap-
	      tured  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 indicates  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 overridden, 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.

       -s, --pid=<file>
	      Have irqbalance write its process id to the specified file.  By default no  pidfile
	      is written.  The written pidfile is automatically 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.  This is a hex mask without the leading '0x', on systems with large numbers  of
	      processors each group of eight hex digits is separated by a comma ','. i.e. 'export
	      IRQBALANCE_BANNED_CPUS=fc0' would prevent irqbalance from  assigning  irqs  to  the
	      7th-12th	cpus  (cpu6-cpu11)  or	'export IRQBALANCE_BANNED_CPUS=ff000000,00000001'
	      would prevent irqbalance from assigning irqs to the 1st (cpu0) and  57th-64th  cpus
	      (cpu56-cpu63).

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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