Re: Preempting kernel tasks

David S. Miller (
Wed, 4 Sep 1996 13:14:37 -0400

From: (Alan Cox)
Date: Tue, 3 Sep 1996 22:18:36 +0100 (BST)

> (btw, kernel preemption IMHO is a sorry and dirty solution for
> the
> problem that it claims to solve)

Its extremely useful for high performance polled IO drivers (such
as the Quickcam). Checking if I need to reschedule costs me about
5% performance on the camera.

I do not argue it's usefulness, it is indeed useful as you have
shown. Other applications exist as well. What I was trying to state
was that the ends need to be acquired in a cleaner fashion, not
that the ends are unnecessary.

David S. Miller