Ingo Molnar wrote:
John Sigler wrote:
Ingo Molnar wrote:
does your test-app have higher priority than softirq--4 ?
PID 4 is [softirq-timer/0] and has priority 50 in SCHED_FIFO. My
process has priority 80 in SCHED_RR. It is waiting for IRQ10.
My user-space app has higher priority than everything except PID 2
which is [posix_cpu_timer]
well what priority does the IRQ 10 kernel thread have? It should be prio
80 too if it's in your critical path.
Is there some form of priority inheritance? Does the IRQ handler get a
priority boost if a high priority task is waiting for it?
I didn't dare mess with the default kernel thread priorities.
# ps -eo pid,class,rtprio,ni,pri,stat,comm
PID CLS RTPRIO NI PRI STAT COMMAND
1 TS - 0 24 Ss init
2 FF 99 - 139 S posix_cpu_timer
3 FF 50 - 90 S softirq-high/0
4 FF 50 - 90 S softirq-timer/0
5 FF 50 - 90 S softirq-net-tx/
6 FF 50 - 90 S softirq-net-rx/
7 FF 50 - 90 S softirq-block/0
8 FF 50 - 90 S softirq-tasklet
9 FF 50 - 90 S softirq-sched/0
10 FF 50 - 90 S softirq-hrtimer
11 FF 50 - 90 S softirq-rcu/0
12 TS - -10 34 S< desched/0
13 FF 1 - 41 S< events/0
14 TS - -5 19 S< khelper
15 TS - -5 19 S< kthread
34 TS - -5 29 S< kblockd/0
35 TS - -5 19 S< kacpid
36 FF 50 - 90 S< IRQ-7
82 TS - -5 29 S< kseriod
101 TS - 0 16 S pdflush
102 TS - 0 24 S pdflush
103 TS - -5 21 S< kswapd0
104 TS - -5 29 S< flush_filesd/0
105 TS - -5 21 S< aio/0
704 FF 50 - 90 S< IRQ-14
720 FF 50 - 90 S< IRQ-12
721 FF 50 - 90 S< IRQ-1
848 FF 50 - 90 S< IRQ-11
913 FF 50 - 90 S< IRQ-10
922 TS - 0 21 Ss sshd
925 TS - 0 24 Ss+ agetty
926 TS - 0 21 Ss+ agetty
931 TS - 0 24 Rs sshd
933 TS - 0 24 Rs bash
# cat /proc/interrupts
CPU0
0: 37 XT-PIC-XT timer
1: 2 XT-PIC-XT i8042
2: 0 XT-PIC-XT cascade
7: 0 XT-PIC-XT acpi
10: 175 XT-PIC-XT eth2, Dta1xx
11: 1129 XT-PIC-XT eth0
12: 4 XT-PIC-XT eth1
14: 21482 XT-PIC-XT ide0
NMI: 0
LOC: 161632
ERR: 0
MIS: 0
IRQ 10 is shared between a NIC and an I/O board.
For eth2, the kernel said:
ACPI: PCI Interrupt 0000:00:0a.0[A] -> Link [LNKC]
-> GSI 10 (level, low) -> IRQ 10
For Dta1xx, the kernel said:
ACPI: PCI Interrupt 0000:02:0e.0[A] -> Link [LNKC]
-> GSI 10 (level, low) -> IRQ 10
Is it possible to avoid the two boards sharing IRQ 10?
Regards.
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