CPU中断数查看
多核CPU每个核心CPU发生中断的数量查看
# mpstat -I SUM -P ALL 1 3
Linux 5.4.0-40-generic (verify-new-511kernel) 08/28/2021 _x86_64_ (72 CPU)09:09:30 AM CPU intr/s
09:09:31 AM all 18762.00
09:09:31 AM 0 253.00
09:09:31 AM 1 256.00
09:09:31 AM 2 253.00
09:09:31 AM 3 253.00
09:09:31 AM 4 254.00
09:09:31 AM 5 260.00
说明:
pstat [-I {SUM| CPU | SCPU}][-P {|ALL}] [internal [count]]
参数 解释
-I 查看中断 {SUM 表示汇总每个CPU上的中断数| SCPU 单个软件中断数}
-P {|ALL} 表示监控哪个CPU, cpu在[0,cpu个数-1]中取值
internal 相邻的两次采样的间隔时间、
count 采样的次数,count只能和delay一起使用
当中断集中在某个CPU时,会把这个CPU打满,建议将中断平均分配每个CPU处理。
查看中断数高的CPU忙于处理哪些中断
命令:cat /proc/interrupts
cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 245 0 0 7134094 IO-APIC-edge timer
8: 0 0 49 0 IO-APIC-edge rtc
9: 0 0 0 0 IO-APIC-level acpi
66: 67 0 0 0 IO-APIC-level ehci_hcd:usb2
74: 902214 0 0 0 PCI-MSI eth0
169: 0 0 79 0 IO-APIC-level ehci_hcd:usb1
177: 0 0 0 7170885 IO-APIC-level ata_piix, b4xxp
185: 0 0 0 59375 IO-APIC-level ata_piix
NMI: 0 0 0 0
LOC: 7104234 7104239 7104243 7104218
ERR: 0
MIS: 0
查看网卡当前中断号绑定的CPU编号
cat /proc/interrupts | head -n1 && cat /proc/interrupts | grep eth
CPU0 CPU1
124: 1733966 0 IR-PCI-MSI 49283073-edge eth0-0
125: 0 0 IR-PCI-MSI 49283074-edge eth0-1
126: 0 0 IR-PCI-MSI 49283075-edge eth0-2
127: 0 0 IR-PCI-MSI 49283076-edge eth0-3
128: 0 0 IR-PCI-MSI 49283077-edge eth0-4
129: 0 0 IR-PCI-MSI 49283078-edge eth0-5
130: 0 0 IR-PCI-MSI 49283079-edge eth0-6
131: 0 0 IR-PCI-MSI 49283080-edge eth0-7
如上看每个网卡队列对应一个中断编号,以eth0-0 网卡队列为例,对应中断号为124 查看该队列绑定的CPU
cat /proc/irq/124/smp_affinity_list 查看绑定的CPU列表,(10进制表示)
# cat /proc/irq/124/smp_affinity_list
0
如上表示绑定的为CPU0
cat /proc/irq/124/smp_affinity 查看绑定的CPU列表 (16进制表示)
# cat /proc/irq/124/smp_affinity
00,00000000,00000001
将中断号绑定所有CPU
绑定中断到0、1、2、3核
root@verify-new-511kernel:~# echo 0,1,2,3 > /proc/irq/124/smp_affinity_list
root@verify-new-511kernel:~# cat /proc/irq/124/smp_affinity
00,00000000,0000000f
root@verify-new-511kernel:~# cat /proc/irq/124/smp_affinity_list
0-3
root@verify-new-511kernel:~#
只绑定到个别核心例如CPU0和CPU1 可以写0-1 代表 连续的核心范围
# echo 0-1 > /proc/irq/124/smp_affinity_list
# cat /proc/irq/124/smp_affinity_list
0-1
# cat /proc/irq/124/smp_affinity
00,00000000,00000003
绑定所有的核心(本例72个核心)
root@verify-new-511kernel:~# echo 0-71 > /proc/irq/124/smp_affinity_list
root@verify-new-511kernel:~# cat /proc/irq/124/smp_affinity
ff,ffffffff,ffffffff