Device polling, with SMP?
lists-freebsd at silverwraith.com
Thu Nov 20 11:50:42 PST 2003
On Thu, Nov 20, 2003 at 12:58:58PM -0500, Don Bowman wrote:
> > I read Luigi's paper at info.iet.unipi.it/~luigi/polling/ which at the
> > end implies that DEVICE_POLLING on an SMP box might not make
> > sense - but
> > right now for me it would make sense as both CPU's are locked:
> > One tries to handle interrupts
> > The other tries to manage the application
> > I could try forcing DEVICE_POLLING to compile as is suggested in that
> > URL but I wanted to see if anyone had tried this before.
> > The interface is an FXP.
> We use it on em. I just commented out the #error line that
> says you can't do it.
> device polling in idle doesn't work, and the user/system time
> calculation isn't correct, but it works well otherwise.
This is pretty much what I wanted to confirm thanks!
In which way is the system/user time incorrect? Always, or only under
high load? what about it is incorrect? My skills are limited but I might
take a stab at fixing that.
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