Re: What do people think about adaptive polling?

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Hasso Tepper wrote:
> Simon 'corecode' Schubert wrote:
> > I think that's the equivalent of fast and slow interrupts in bsd.  we
> > basically (with some exceptions, like serial io) do all the work in the
> > slow interrupt handler (= interrupt thread).
> As far as I understand it, no. Correct me if I'm wrong, but fast and slow
> interrupts is about splitting interrupts into two kinds - serial io is
> example of fast interrupt and network io is example of slow interrupt.

yes.  i was under the impression that we just read the data from the port in the fast interrupt and then wake up the so-called bottom half.  i could be wrong, of course.

> Sofirq in Linux is about splitting work done to serve one interrupt into two
> parts - minimal and very fast interrupt handler schedules task done in
> sofirq thread.

maybe i understand dragonfly's interrupt processing wrong, but i would look at our interrupt system as almost entirely "soft".  the hard, fast part is generic, which simply records the event of an interrupt.  because of that the interrupt thread gets woken up, which is essentially a "soft" one.  thinking about this, i could also be entirely wrong (but i hope i'm not).

cheers
 simon

--
Serve - BSD     +++  RENT this banner advert  +++    ASCII Ribbon   /"\
Work - Mac      +++  space for low €€€ NOW!1  +++      Campaign     \ /
Party Enjoy Relax   |   http://dragonflybsd.org      Against  HTML   \
Dude 2c 2 the max   !   http://golden-apple.biz       Mail + News   / \

Attachment: signature.asc
Description: OpenPGP digital signature