Re: adding swap when expanding root filesystem

-- Start of PGP signed section.
> Hi Mike,
> 
> On Mon, Nov 07, 2022 at 10:10:38AM -0600, Mike Karels wrote:
> > This question is not really arm-specific, but I couldn't think of a better
> > mailing list for it.
> > 
> > There are peridic issues reported on small systems like Raspberry Pi
> > where people are running buildworld or poudriere and running out of
> > memory.  As the user gets no control over the disk layout when installing,
> > there is no option to add swap space on the install image.  I have added
> > swap space on a USB disk, but this is often not an option.  It occurred
> > to me that it might be reasonable to add swap space before expanding
> > the root filesystem if there is sufficient space.  I have a prototype,
> > and wondered if this is a good thing to do.  Granted, this will often
> > create swap on microSD, which is not optimal, but probably better than
> > nothing.
> > 
> > The current prototype creates a swap partition which is 1/10 of the disk
> > if the disk is at least 15 GB and the initial root partition is no more
> > than 1/3 of the disk, but only up to 1.5x of physical memory.  I would
> > probably enable this by default, but provide a way to disable it via a
> > kenv variable and/or a variable in /etc/rc.conf.
> > 
> > Thoughts?
> > 
> > 		Mike
> 
> That would be very welcomed addition. I personally ofter run into problems
> when I try get a crash dump from my RPi4, since no dumpdev can be set
> without a separate swap partion. An USB stick worked for I while, but it
> just went dead at some point.

+1 please.

> 
> And the genet(4) driver doesn't support netdump(4).
> 
> --Gordon
-- End of PGP section, PGP failed!

-- 
Rod Grimes                                                 rgrimes@freebsd.org