cvs commit: src/release/i386 drivers.conf

[Ruslan Ermilov]

On Sat, Jul 26, 2003 at 06:54:48PM +1000, Bruce Evans wrote:
> On Fri, 25 Jul 2003, Ruslan Ermilov wrote:
> 
> > On Fri, Jul 25, 2003 at 01:41:33AM -0600, Scott Long wrote:
> > > Ruslan Ermilov wrote:
> > > >Which reminds me.  The floppy wasn't overflowing when building
> > > >5.x snapshot on 4.x, due to the differences in file system
> > > >layout between 4.x and 5.x.  Please see the attached if you're
> > > >interested.
> > > ...
> > > Now that -O2 is the default for newfs in 5-current, does the 'Oflag ==
> > > 2' trick still work?
> > >
> > Yes it does:
> >
> > 1.  doFS.sh creates file systems with -O1
> > 2.  The patch affects the -O1 case:
> >
> > > Even if it does, it feels like a hack to me.  I'd
> > > rather that newfs have an option to directly override the number of
> > > c/g's, rather than rely on indirect calculations and magic constants.
> > >
> > *Shrug*, an option to override a minimum value?
> >
> > > Please don't commit this until we have discussed it more.
> 
> I think the 'Oflag == 2' trick is a hack to avoid touching the -O2 case,
> since the -O2 implementors haven't responded and others don't have enough
> experience with -O2 to know what is right.  OTOH, with -O1 it is well
> known that you can't have too few cylinder groups except possibly for
> unuseful disk sizes like 40MB, so removing the limit just fixes a bug.
> Anyway, there was no limit in until recently, so we have lots of practical
> experience with using 1 cylinder group.
> 
Yes, this is exactly the case.  Kirk never responded, and I was
not sure about the -O2 case.


Cheers,
-- 
Ruslan Ermilov		Sysadmin and DBA,
ru at sunbay.com		Sunbay Software Ltd,
ru at FreeBSD.org		FreeBSD committer
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