irqbalance服务描述

irqbalance 是一个 Linux 守护进程，它在计算机系统中的处理器和内核之间分配中断。
irqbalance 的设计目标是在节能和最佳性能之间找到平衡。
在很大程度上，irqbalance 所做的工作对我们来说是不可见的。
守护进程在功耗和性能之间取得平衡。

irqbalance 与多处理器 x86. x86_64 和 AMD 系统相关。
irqbalance 配置文件 /etc/sysconfig/irqbalance 允许选择可以分配哪些中断的 CPU。
下面是来自 RHEL 7 系统的示例配置文件。

# cat /etc/sysconfig/irqbalance
# irqbalance is a daemon process that distributes interrupts across
# CPUS on SMP systems. The default is to rebalance once every 10
# seconds. This is the environment file that is specified to systemd via the
# EnvironmentFile key in the service unit file (or via whatever method the init
# system you're using has.
#
# ONESHOT=yes
# after starting, wait for a minute, then look at the interrupt
# load and balance it once; after balancing exit and do not change
# it again.
#IRQBALANCE_ONESHOT=
#
# IRQBALANCE_BANNED_CPUS
# 64 bit bitmask which allows you to indicate which cpu's should
# be skipped when reblancing irqs. Cpu numbers which have their
# corresponding bits set to one in this mask will not have any
# irq's assigned to them on rebalance
#
#IRQBALANCE_BANNED_CPUS=
#
# IRQBALANCE_ARGS
# append any args here to the irqbalance daemon as documented in the man page
#
#IRQBALANCE_ARGS=

可配置项如下所示：

服务详情

init.d 脚本位置 -> /etc/init.d/irqbalance
“chkconfig -list [service]”示例

# chkconfig --list irqbalance
irqbalance      0:off   1:off   2:on    3:on    4:on    5:on    6:off

可用的服务使用选项：

# service irqbalance
Usage: /etc/init.d/irqbalance {start|stop|status|restart|reload|condrestart}

# service irqbalance start
Starting irqbalance:                                       [  OK  ]

# service irqbalance stop
Stopping irqbalance:                                       [  OK  ]

# service irqbalance status
irqbalance (pid 14857) is running...

# service irqbalance restart
Stopping irqbalance:                                       [  OK  ]
Starting irqbalance:                                       [  OK  ]

# service irqbalance reload
Stopping irqbalance:                                       [  OK  ]
Starting irqbalance:                                       [  OK  ]

# service irqbalance condrestart

它运行哪些守护进程：/usr/sbin/irqbalance
它加载哪些模块：无

其他信息

RPM 包：irqbalance-[版本]-[发布]
例如：irqbalance-1.0.4-10.el6.x86_64

配置文件：/etc/sysconfig/irqbalance
项目主页：https://github.com/Irqbalance/irqbalance

什么时候不应该使用

在大多数情况下，irqbalance 服务是启用的，除非：

• 出于很好的理由（低延迟、实时要求等）手动将应用程序/IRQ 固定到特定内核
• 虚拟客人。这实际上没有意义，因为除非我们将访客固定到特定的 CPU 和 IRQ 以及专用的网络/存储硬件，否则我们可能看不到在裸机上的好处。