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4. irqstats

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
i801_smbus [18]	i18	derive			Interrupt 18, for device(s): i801_smbus
ehci_hcd:usb1 [23]	i23	derive			Interrupt 23, for device(s): ehci_hcd:usb1
ttyS0 [4]	i4	derive			Interrupt 4, for device(s): ttyS0
rtc0 [8]	i8	derive			Interrupt 8, for device(s): rtc0
soc_dts [86]	i86	derive			Interrupt 86, for device(s): soc_dts
enp3s0 [87]	i87	derive			Interrupt 87, for device(s): enp3s0
enp3s0-rx-0 [88]	i88	derive			Interrupt 88, for device(s): enp3s0-rx-0
enp3s0-rx-1 [89]	i89	derive			Interrupt 89, for device(s): enp3s0-rx-1
acpi [9]	i9	derive			Interrupt 9, for device(s): acpi
enp3s0-tx-0 [90]	i90	derive			Interrupt 90, for device(s): enp3s0-tx-0
enp3s0-tx-1 [91]	i91	derive			Interrupt 91, for device(s): enp3s0-tx-1
ahci[0000:00:13.0] [92]	i92	derive			Interrupt 92, for device(s): ahci[0000:00:13.0]
i915 [93]	i93	derive			Interrupt 93, for device(s): i915
snd_hda_intel:card0 [94]	i94	derive			Interrupt 94, for device(s): snd_hda_intel:card0
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)