Date: Mon, 7 Nov 2022 09:52:06 -0800 From: bob prohaska <fbsd@www.zefox.net> To: Mike Karels <mike@karels.net> Cc: freebsd-arm@freebsd.org, jmg@freebsd.org Subject: Re: adding swap when expanding root filesystem Message-ID: <20221107175206.GA49113@www.zefox.net> In-Reply-To: <202211071610.2A7GAcHl090048@mail.karels.net> References: <202211071610.2A7GAcHl090048@mail.karels.net>
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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? For starters, is there any hope of making bsdinstall run from the microSD and installing FreeBSD via the traditional process on USB? No need to limit to USB, but that's a useful option for RPi and one option for many more devices. That treats microSD like a boot floppy. I haven't looked at bsdinstall in a very long time, so maybe the traditional installation process isn't as I remember it. ISTR it allowing selection of a boot device, a swap device and at least one /usr device. Maybe I'm confusing it with Jordan Hubbard's installer. Thanks for reading, and apologies if I'm hopelessly out of date. bob prohaska
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