Subject: Re: understanding spl levels
To: Charles M. Hannum <abuse@spamalicious.com>
From: Hubert Feyrer <hubert.feyrer@informatik.fh-regensburg.de>
List: tech-kern
Date: 03/29/2004 22:10:57
On Mon, 29 Mar 2004, Charles M. Hannum wrote:
> It's not quite that simple. splsoftnet() is used for some of the "lower half"
> of network drivers as well, in places where it's not necessary to block
> hardware interrupts.
>
> I made this change back in... 1994 or 1995? Before that, most of this work
> was done at splimp(), which blocks almost everything. In particular, it was
> blocking the "lower half" of tty drivers and causing severe performance
> problems for tty-based protocols on many systems.
So um... should we put anything of this into spl.9? If so, what?
- Hubert
--
Hubert Feyrer <hubert@feyrer.de>