On Sun, Aug 11, 2024 at 06:54:55PM -0700, Steve Rikli wrote: > I'm re-installing several old and new systems with NetBSD 10.0, one of > them is a 32-bit ITX PC, with VIA C7 CPU. > > It has small memory (1GB max) but plenty of disk (128GB SSD). sysinst > says default size of "25%" for /tmp; from experimenting with other PC's, > I believe that's "25% of main memory" (RAM) with tmpfs.
Yes. > Two questions: > > 1) is my understanding correct? I.e. does tmpfs use main memory for > backing, rather than swap or something else? > > This page says memory first, then swap: > https://www.netbsd.org/docs/guide/en/chap-tuning.html#tuning-system-mfs > so I'm mostly just checking. Yes, but the size limit is derived from ram size just as a big thumbs number (assuming machines with big ram will have big workloads). You can set the size to e.g. 100mb instead, or whatever fits your workloads. > > 2) can I configure /tmp as ffs rather than tmpfs? Yes, but in that case you may consider not making /tmp a separate mount point (in sysinst: set size to 0). This removes the size limit - which may be good or bad, depending on your usage. Martin
