freebsd stable - May 2005 - Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches)

Kris Kennaway wrote:
> 
> Also try defining PREEMPTION in your kernel on 5.x and above (if you
> are running i386 or amd64).  There have been very occasional reports
> of panics with this option enabled (although I use it everywhere and
> have not seen problems on my heavily loaded machines), but interactive
> response should be much better.
> 
kris,

i cannot find (a description of) PREEMPTION in NOTES or GENERIC (on 5.4 
on i386).

am i missing something?

cheers,

martin

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	It's in /usr/src/sys/conf/NOTES.
	I think this is due to it being an architecture independent option.

- --
Regards, Pedro.


martinko wrote:
> Kris Kennaway wrote:
> 
>>
>> Also try defining PREEMPTION in your kernel on 5.x and above (if you
>> are running i386 or amd64).  There have been very occasional reports
>> of panics with this option enabled (although I use it everywhere and
>> have not seen problems on my heavily loaded machines), but interactive
>> response should be much better.
>>
> 
> kris,
> 
> i cannot find (a description of) PREEMPTION in NOTES or GENERIC (on 5.4
> on i386).
> 
> am i missing something?
> 
> cheers,
> 
> martin
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On May 24, 2005 11:39 am, martinko wrote:
> Kris Kennaway wrote:
> > Also try defining PREEMPTION in your kernel on 5.x and above (if you
> > are running i386 or amd64).  There have been very occasional reports
> > of panics with this option enabled (although I use it everywhere and
> > have not seen problems on my heavily loaded machines), but interactive
> > response should be much better.
> i cannot find (a description of) PREEMPTION in NOTES or GENERIC (on 5.4
> on i386).
> am i missing something?
There are two NOTES files for each CPU architecture.

One is for the CPU architecture dependent items and is located 
at /usr/src/sys/<arch>/conf/NOTES  Just replace <arch> with the CPU 
architecture (i386, amd64, etc).

The other is for items that apply to all CPU architectures, and is located 
at /usr/src/sys/conf/NOTES.

You have to read both.  The PREEMPTION option is in the second file above.
-- 
Freddie Cash
fcash@ocis.net

On Tue, May 24, 2005 at 08:39:23PM +0200, martinko
wrote:
> Kris Kennaway wrote:
> >
> >Also try defining PREEMPTION in your kernel on 5.x and above (if you
> >are running i386 or amd64).  There have been very occasional reports
> >of panics with this option enabled (although I use it everywhere and
> >have not seen problems on my heavily loaded machines), but interactive
> >response should be much better.
> >
> 
> kris,
> 
> i cannot find (a description of) PREEMPTION in NOTES or GENERIC (on 5.4 
> on i386).
> 
> am i missing something?
Surely :)

Kris
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