IRQ Labeling
IRQ IDs are now labeled according to their device functionality.
To obtain the current devices IRQ mapping:
Enable the debug status:
sysctl dev.mce.<N>.conf.debug_stats=
1
Dump the IRQ vectors by reading the hw_ctx_debug sysctl:
sysctl dev.mce.<N>.hw_ctx_debug
Output Example
sysctl -n dev.mce.0
.hw_ctx_debug
pages irq 99
command irq 100
async irq 101
channel 0
rq 131
cq 17
irq 102
channel 0
tc 0
sq 130
cq 16
irq 102
channel 1
rq 134
cq 19
irq 103
channel 1
tc 0
sq 133
cq 18
irq 103
channel 2
rq 137
cq 21
irq 104
channel 2
tc 0
sq 136
cq 20
irq 104
channel 3
rq 140
cq 23
irq 105
channel 3
tc 0
sq 139
cq 22
irq 105
channel 4
rq 143
cq 25
irq 106
channel 4
tc 0
sq 142
cq 24
irq 106
channel 5
rq 146
cq 27
irq 107
channel 5
tc 0
sq 145
cq 26
irq 107
channel 6
rq 149
cq 29
irq 108
channel 6
tc 0
sq 148
cq 28
irq 108
channel 7
rq 152
cq 31
irq 109
channel 7
tc 0
sq 151
cq 30
irq 109
channel 8
rq 155
cq 49
irq 110
channel 8
tc 0
sq 154
cq 48
irq 110
channel 9
rq 158
cq 51
irq 111
channel 9
tc 0
sq 157
cq 50
irq 111
channel 10
rq 161
cq 53
irq 112
channel 10
tc 0
sq 160
cq 52
irq 112
channel 11
rq 164
cq 55
irq 113
channel 11
tc 0
sq 163
cq 54
irq 113
The value after the “irq” keyword indicates which system IRQ vector is used for the given resource. This IRQ value is accepted by utilities such as cpuset(1). At the moment, there are five different resources that use IRQ vector:
Page allocation or free interrupts
Command interrupts
Asynchronous event interrupts
Transmit ring completion interrupts
Receive ring completion interrupt