Re: RFC: IRQ affinity (aka interrupt routing)

[Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost>]

Hi martin,

Thank you very much for your comment.

(2014/07/25 18:15), Martin Husemann wrote:
> A few general comments:
>
>   - best UI is no UI - the kernel should distribute interrupts automatically
>     (if possible) as fair as possible over time doiing some statistics

I agree the computer should distribute interrupts automatically, but
I think balancing interrupts is too complex for the kernel. So I think
the balancing should be done by the userland daemon which use the UI.
Implementing and tuning the userland daemon are future works.

>   - a UI to wire some device interrupts to a special CPU would be ok,
>     I prefer a new intrctrl for that
>
>   - vmstat -i could gain an additional column with the current target cpu
>     of the interrupt

I am afraid of breaking backward compatibility, so I avoid to change
existing commands.

>   - the device name is nice, but what about shared interrupts?

I forgot shared interrupts... In the current implement, the device name
is overwritten by the device established later. Of course this is ugly,
so I must fix it.


Thanks,

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Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost>