[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: RFC: IRQ affinity (aka interrupt routing)
(2014/07/27 1:18), Mindaugas Rasiukevicius wrote:
Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost> wrote:
The implementation is consist of following three pathes:
(2) new kernfs file to show interrupt numbers per cpu
"vmstat -i" cannot show interrupt numbers per cpu. So I
implement new kernfs file to show per cpu. The usage is "cat
/kern/interrupts". For example, we can see below output
which is like linux's /proc/interrupts
IRQ CPU#00 CPU#01
1 0* 0
3 0* 0
4 0* 0
6 0* 0
7 0* 0
9 0* 0
12 0* 0
14 0* 0
15 0* 0
16 108* 0
17 1193055* 0
18 680358 150*
"*" mean the cpu is routed the IRQ number interrupts.
Agree with Martin that vmstat -i could grow per-CPU counters, but it might
be a bit more work than you want to do. So, up to you. :)
I consider vmstat -i grow per-CPU counters after implementing intrctl(8).
It is no problem to change the output format of vmstat -i, doesn't it?
Above implementation works well, but I think the UI is not so good.
So, I am going to implement new command intrctl(8). The usage is consist
of below two sub command.
(A) "intrctl list"
This sub command show interrupt numbers per cpu (like
(B) "intrctl -i 18 -c 1"
This sub command let interrupts route other cpu. "18" is IRQ
number, "1" is cpuid (like "sysctl -w kern.cpu_affinity.irq=18:1").
Could you comment which UI is good, current "sysctl and /kern/interrupts"
or new "intrctl"?
I do not really like /kern/interrupts. intrctl(8) seems like a good
interface. Note that cpuctl(8) has intr/nointr commands which are not
enabled at this moment. They should move to intrctl(8).
intrctl(8) gain agreements with two developers, and It seems to gain more
agreements, maybe. So I approach to implement intrctl(8). Yes, you told
me the cpuctl(8) sub command at previous meeting :) I move cpuctl intr/
nointr sub comamnd to intrctl(8).
Internet Initiative Japan Inc.
Device Engineering Section,
Core Product Development Department,
Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost>
Main Index |
Thread Index |