Date: Mon, 29 Jan 2001 09:59:58 -0800 From: Peter Wemm <peter@netplex.com.au> To: mjacob@feral.com Cc: Bruce Evans <bde@zeta.org.au>, current@FreeBSD.ORG Subject: Re: config(8) broken Message-ID: <200101291759.f0THxw454602@mobile.wemm.org> In-Reply-To: <Pine.BSF.4.21.0101290914501.23116-100000@beppo.feral.com>
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Matthew Jacob wrote:
>
> *groan* I'm having trouble believing that *config* of all things is now
> dependent on time to avoid bugs... This is *one* for the books....
Yep. That's why I disabled it and will replace it with something more
robust. In hindsight it was Not A Good Thing.
> On Mon, 29 Jan 2001, Peter Wemm wrote:
>
> > Bruce Evans wrote:
> > > On Mon, 29 Jan 2001, Peter Wemm wrote:
> > >
> > > > Bruce Evans wrote:
> > > > > Config now removes almost all headers:
> > > > > ...
> > > > > This is starting from compile directory populated by a previous versi
on
> > > > > of config. Starting from scratch, config seems to work for the first
> > > > > run. The second run complains about all headers, deletes them all, a
nd
> > > > > doesn't create any. The third run seems to work...
> > > >
> > > > What are the chances that you did this on a mount -o noatime file syste
m?
> > >
> > > Very high :-).
> >
> > Heh. :-)
> >
> > > I'm surprised the bug doesn't affect fast machines, since config doesn't
> > > seem to sleep for >= 1 second to ensure that the atimes advance with
> > > the standard mount options.
> >
> > I was primarily testing it on a dual P3-733 w/ 1G ram which was running
> > config nearly instantly. I never saw this problem until I tested it
> > on a fresh machine that (by sheer chance) happened to be running noatime (i
t
> > was a laptop). For what it's worth, I did roll the start time back by one
> > second to give a bit more comfort - getting rid of the trays isn't all that
> > critical.
> >
> > For UFS at least, we seem to update the atime instantly but schedule
> > writeback to the inode "whenever".
> >
> > 148# date ; ls -lutT foo1 ; cat foo1 ; ls -lutT foo1; date
> > Mon Jan 29 08:18:02 PST 2001
> > -rw-r--r-- 1 root wheel 4 Jan 29 08:16:25 2001 foo1
> > foo
> > -rw-r--r-- 1 root wheel 4 Jan 29 08:18:02 2001 foo1
> > Mon Jan 29 08:18:02 PST 2001
> >
> > This is all within the same second "tick" and the atime change was visible.
> >
> > > Bruce
> >
> >
> > Cheers,
> > -Peter
> > --
> > Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
> > "All of this is for nothing if we don't go to the stars" - JMS/B5
> >
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-current" in the body of the message
> >
>
>
Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5
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