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irqbalance - distribute hardware interrupts across processors on a multiprocessor system




The purpose of irqbalance is to distribute hardware interrupts across processors on a
multiprocessor system in order to increase performance.


-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).

-j, --journal
Enables log output optimized for systemd-journal.

-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 affinity 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
prevent 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

This allows a user to specify the cache level at which irqbalance partitions cache
domains. Specifying a deeper cache may allow a greater degree of flexibility for
irqbalance to assign IRQ affinity to achieve greater performance increases, but
setting a cache depth too large on some systems (specifically where all CPUs on a
system share the deepest cache level), will cause irqbalance to see balancing as
unnecessary. irqbalance --deepestcache=2

The default value for deepestcache is 2.

-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. Note that the
device path argument will point to the parent directory from which the IRQ
attributes directory may be directly opened. 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.

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 devices 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.

hintpolicy=[exact | subset | ignore ]
This allows a user to override the globally set hintpolicy for a given irq. Use is
identical to the --hintpolicy setting, but applied per irq

-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.
It is ignored when used with --debug or --foreground.

-t, --interval=<time>
Set the measurement time for irqbalance. irqbalance will sleep for <time> seconds
between samples of the irq load on the system cpus. Defaults to 10.


Same as --oneshot.

Same as --debug.

Provides a mask of CPUs which irqbalance should ignore and never assign interrupts


SIGHUP Forces a rescan of the available IRQs and system topology.



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