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Graph information

Shows the number of different IRQs received by the kernel. High disk or network traffic can cause a high number of interrupts (with good hardware and drivers this will be less so). Sudden high interrupt activity with no associated higher system activity is not normal.

Field	Internal name	Type	Warning	Critical	Info
timer [0]	i0	derive			Interrupt 0, for device(s): timer
i8042 [1]	i1	derive			Interrupt 1, for device(s): i8042
virtio0 [10]	i10	derive			Interrupt 10, for device(s): virtio0
uhci_hcd:usb1 [11]	i11	derive			Interrupt 11, for device(s): uhci_hcd:usb1
i8042 [12]	i12	derive			Interrupt 12, for device(s): i8042
ata_piix [14]	i14	derive			Interrupt 14, for device(s): ata_piix
ata_piix [15]	i15	derive			Interrupt 15, for device(s): ata_piix
virtio1-config [24]	i24	derive			Interrupt 24, for device(s): virtio1-config
virtio1-control [25]	i25	derive			Interrupt 25, for device(s): virtio1-control
virtio1-event [26]	i26	derive			Interrupt 26, for device(s): virtio1-event
virtio1-request [27]	i27	derive			Interrupt 27, for device(s): virtio1-request
virtio1-request [28]	i28	derive			Interrupt 28, for device(s): virtio1-request
virtio1-request [29]	i29	derive			Interrupt 29, for device(s): virtio1-request
virtio1-request [30]	i30	derive			Interrupt 30, for device(s): virtio1-request
virtio1-request [31]	i31	derive			Interrupt 31, for device(s): virtio1-request
virtio1-request [32]	i32	derive			Interrupt 32, for device(s): virtio1-request
virtio1-request [33]	i33	derive			Interrupt 33, for device(s): virtio1-request
virtio1-request [34]	i34	derive			Interrupt 34, for device(s): virtio1-request
virtio3-config [35]	i35	derive			Interrupt 35, for device(s): virtio3-config
virtio3-input.0 [36]	i36	derive			Interrupt 36, for device(s): virtio3-input.0
virtio3-output.0 [37]	i37	derive			Interrupt 37, for device(s): virtio3-output.0
virtio2-config [38]	i38	derive			Interrupt 38, for device(s): virtio2-config
virtio2-virtqueues [39]	i39	derive			Interrupt 39, for device(s): virtio2-virtqueues
ttyS0 [4]	i4	derive			Interrupt 4, for device(s): ttyS0
floppy [6]	i6	derive			Interrupt 6, for device(s): floppy
rtc0 [8]	i8	derive			Interrupt 8, for device(s): rtc0
acpi [9]	i9	derive			Interrupt 9, for device(s): acpi
Function call interrupts	iCAL	derive			Interrupt CAL (Function call interrupts)
Deferred Error APIC interrupts	iDFR	derive			Interrupt DFR (Deferred Error APIC interrupts)
IRQ work interrupts	iIWI	derive			Interrupt IWI (IRQ work interrupts)
Local timer interrupts	iLOC	derive			Local (pr. CPU core) APIC timer interrupt. Until 2.6.21 normaly 250 or 1000 pr second. On modern 'tickless' kernels it more or less reflects how busy the machine is.
Machine check exceptions	iMCE	derive			Interrupt MCE (Machine check exceptions)
Machine check polls	iMCP	derive			Interrupt MCP (Machine check polls)
Non-maskable interrupts	iNMI	derive			Nonmaskable interrupt. Either 0 or quite high. If it's normaly 0 then just one NMI will often mark some hardware failure.
Nested posted-interrupt event	iNPI	derive			Interrupt NPI (Nested posted-interrupt event)
Posted-interrupt notification event	iPIN	derive			Interrupt PIN (Posted-interrupt notification event)
Posted-interrupt wakeup event	iPIW	derive			Interrupt PIW (Posted-interrupt wakeup event)
Performance monitoring interrupts	iPMI	derive			Interrupt PMI (Performance monitoring interrupts)
Rescheduling interrupts	iRES	derive			Interrupt RES (Rescheduling interrupts)
APIC ICR read retries	iRTR	derive			Interrupt RTR (APIC ICR read retries)
Spurious interrupts	iSPU	derive			Interrupt SPU (Spurious interrupts)
Threshold APIC interrupts	iTHR	derive			Interrupt THR (Threshold APIC interrupts)
TLB shootdowns	iTLB	derive			Interrupt TLB (TLB shootdowns)
Thermal event interrupts	iTRM	derive			Interrupt TRM (Thermal event interrupts)