Re: Proposed package removals after 2016Q4

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Dec 20, 2016 at 02:27:27PM -0500, Greg Troxel wrote:
> 
> Manuel Bouyer <bouyer%antioche.eu.org@localhost> writes:
> 
> >> But how are you causing xm to work?  Are you running different daemons
> >> than the standard recommendation?  Different rc.d files?  I would think
> >> you'd need the old rc.d files from before the xm/xl change.
> >
> > Afaik the scripts provided with xentools42 works fine for xm.
> > Maybe you need to change xl to xm in xendomains but that's it.
> 
> OK - HOWTO updated.

thanks !

> 
> >> > It's the problem that xl runs things in parallel, while xm
> >> > serialises them.
> >> 
> >> Do you mean that on startup, the xl-based xendomains script that is part
> >> of the xentools42 package causes "xl start" to be fired off for all
> >> domains at once, rather than how "xm start" somewhat causes the next to
> >> wait, perhaps by waiting until it's mostly started to return?
> >
> > all the scripts to configure devices are started in parallel.
> > I have modified scripts (for editing /etc/ipf.conf at
> > domU startup, mostly), which can't be run in parallel.
> 
> So if your scripts don't do things needing serializiation, it's ok?

It is. I'm running xen 4.5 or 4.6 on servers that don't need it at this
time.

> 
> > We now have locking in these scripts so this should be safe, but I've
> > not tested with 10s of interfaces as I have on my servers.
> > (when I tried xl on these servers, it would time out configuring
> > virtual interfaces because I had too much, but the locking I added at this
> > time was too heavy).
> 
> OK - put in HOWTO with caution about testing.
> 
> All in all, I gather that people who don't do special stuff in custom
> scripts (that needs locking) will be ok with xl.

The locking is there (it's needed for file-backed virtual disks, so that
the same vnd isn't allocated twice). I just didn't test it for my
custom scripts with lots of interfaces.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--