c1af476ab1
Often systems don't populate ACPI correctly, and inform the OS that a particular device isn't local to any node (numa_node == -1). This property in polscript allows you to override that setting, so that numa nodes can be properly specified based on documentation Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
148 lines
4.8 KiB
Groff
148 lines
4.8 KiB
Groff
.\"Generated by db2man.xsl. Don't modify this, modify the source.
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..
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.TH "IRQBALANCE" 1 "Dec 2006" "Linux" "irqbalance"
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.SH NAME
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irqbalance \- distribute hardware interrupts across processors on a multiprocessor system
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.SH "SYNOPSIS"
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.nf
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\fBirqbalance\fR
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.fi
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.SH "DESCRIPTION"
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.PP
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The purpose of \fBirqbalance\fR is distribute hardware interrupts across processors on a multiprocessor system in order to increase performance\&.
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.SH "OPTIONS"
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.TP
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.B --oneshot
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Causes irqbalance to be run once, after which the daemon exits
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.TP
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.B --debug
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Causes irqbalance to print extra debug information. Implies --foreground
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.TP
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.B --foreground
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Causes irqbalance to run in the foreground (without --debug)
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.TP
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.B --hintpolicy=[exact | subset | ignore]
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Set the policy for how irq kernel affinity hinting is treated. Can be one of:
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.P
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.I exact
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irq affinity hint is applied unilaterally and never violated
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.P
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.I subset
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irq is balanced, but the assigned object will be a subset of the affintiy hint
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.P
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.I ignore
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irq affinity hint value is completely ignored
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.TP
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.B --powerthresh=<threshold>
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Set the threshold at which we attempt to move a cpu into powersave mode
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If more than <threshold> cpus are more than 1 standard deviation below the
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average cpu softirq workload, and no cpus are more than 1 standard deviation
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above (and have more than 1 irq assigned to them), attempt to place 1 cpu in
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powersave mode. In powersave mode, a cpu will not have any irqs balanced to it,
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in an effort to prevent that cpu from waking up without need.
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.TP
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.B --banirq=<irqnum>
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Add the specified irq to the set of banned irqs. irqbalance will not affect
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the affinity of any irqs on the banned list, allowing them to be specified
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manually. This option is addative and can be specified multiple times. For
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example to ban irqs 43 and 44 from balancing, use the following command line:
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.B irqbalance --banirq=43 --banirq=44
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.TP
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.B --banscript=<script>
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Execute the specified script for each irq that is discovered, passing the sysfs
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path to the associated device as the first argument, and the irq vector as the
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second. An exit value of 0 tells irqbalance that this interrupt should balanced
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and managed as a normal irq, while a non-zero exit code indicates this irq
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should be ignored by irqbalance completely (see --banirq above). Use of this
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script provides users the ability to dynamically select which irqs get exluded
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from balancing, and provides an opportunity for manual affinity setting in one
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single code point.
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.B NOTE: The banscript option is deprecated. Please use the
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.B --polscript option instead
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.TP
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.B --policyscript=<script>
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An superset of the functionality found in the --banscript option. When
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specified, the referenced script will execute once for each discovered irq The
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script may specify zero or more key=value pairs that will guide irqbalance in
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the management of that irq. The script will be passed the path to the sysfs
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device that owns the irq and the irq number itself as the first and second
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arguments. Key=value pairs are printed by the script on stdout, and will be
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captured and interpreted by irqbalance. Irqbalance expects a zero exit code
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from the provided utility. Recognized key=value pairs are:
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.TP
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.I ban=[true | false]
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.tP
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Directs irqbalance to exclude the passed in irq from balancing
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.TP
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.I balance_level=[none | package | cache | core]
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This allows a user to override the balance level of a given irq. By default the
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balance level is determined automatically based on the pci device class of the
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device that owns the irq.
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.TP
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.I numa_node=<integer>
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This allows a user to override the numa node that sysfs indicates a given device
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irq is local to. Often, systems will not specify this information in ACPI, and as a
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result devicesa are considered equidistant from all numa nodes in a system.
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This option allows for that hardware provided information to be overridden, so
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that irqbalance can bias irq affinity for these devices toward its most local
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node. Note that specifying a -1 here forces irqbalance to consider an interrupt
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from a device to be equidistant from all nodes.
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.TP
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.B --pid=<file>
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Have irqbalance write its process id to the specified file. By default no
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pidfile is written. The written pidfile is automatically unlinked when
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irqbalance exits.
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.SH "ENVIRONMENT VARIABLES"
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.TP
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.B IRQBALANCE_ONESHOT
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Same as --oneshot
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.TP
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.B IRQBALANCE_DEBUG
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Same as --debug
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.TP
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.B IRQBALANCE_BANNED_CPUS
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Provides a mask of cpus which irqbalance should ignore and never assign interrupts to
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.SH "SIGNALS"
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.TP
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.B SIGHUP
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Forces a rescan of the available irqs and system topology
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.SH "Homepage"
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http://code.google.com/p/irqbalance
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