6.0 and "options PREEMPTION"

[Doug Poland]

On Fri, Oct 28, 2005 at 02:04:37PM +0100, Robert Watson wrote:
> On Thu, 27 Oct 2005, Doug Poland wrote:
> 
> >	One of the other nice benefits to the SMPVFS work is that with our
> >	fully preemptive 6.x kernel, not holding the Giant lock over the
> >	file system code lets the file system code not only preempt lower
> >	precedence kernel threads, such as background crypto operations or
> >	file system operations, but be preempted by more timing critical
> >	code, such as sound card interrupts, network I/O, and so on.
> >
> >Does this mean that options PREEMPTION is assumed in 6.0?  If not,
> >could someone explain or point me to some docs that will help me
> >understand.
> 
> In FreeBSD 6.0 and higher, options PREEMPTION appears in the default
> kernel configuration (GENERIC).
> 
Thank you

> When upgrading from earlier revisions, if you keep the same config
> file, you'll need to add it manually.  With the advent of "include"
> support in newer FreeBSD versions, I find I generally have my own
> include file include GENERIC, then add nodevice/nooptions to remove
> things I don't want, and device/options to add things I do want.  The
>
I've been using the include technique for some time but was unaware of
nodevice/nooptions.  Sounds cleaner that commenting out unwanted devices
and options.

-- 
Regards,
Doug