On 11/17/12 14:08, Warren Block wrote: > On Sat, 17 Nov 2012, Gary Aitken wrote: > >> On 11/16/12 21:38, Warren Block wrote: >>> On Fri, 16 Nov 2012, Gary Aitken wrote: >>> >>>> On 11/16/12 12:10, Warren Block wrote: >>>> >>>>> Additional SSD suggestions: when creating partitions, leave out the swap >>>>> partition. If you have lots of memory, leave out the /tmp partition. Add >>>>> that extra space to the /usr partition. >>>>> >>>>> Format the UFS filesystems with -Ut, for soft updates and TRIM support. >>>>> (Make sure your SSD supports TRIM, almost all do.) (I don't use soft >>>>> updates journaling.) >>>>> >>>>> Use dd(1) to make a zero-filled file on /usr somewhere, say /usr/swap. >>>>> Make it the size you want swap to be, and do not make it a sparse file. >>>>> Tell the system to use the swapfile in /etc/rc.conf: >>>>> >>>>> swapfile="/usr/swap" >>>>> >>>>> Use tmpfs for /tmp in /etc/fstab: >>>>> >>>>> tmpfs /tmp tmpfs rw,mode=01777 0 0 >> >> When using the above in /etc/fstab to establish a tmp file, >> how does the size of /tmp get established? >> Is it limited only by the available swap, >> or is it possible to put an upper bound on it that is smaller than swap? > > It's free VM, which should be available RAM plus available swap. Yes, you > can easily limit the maximum size: > > tmpfs /tmp tmpfs rw,mode=01777,size=1073741824 0 0 > > Untested, but I think that's correct.
Where is that documented? I tried: man mount man fstab refers to "See the options flag (-o) in the mount(8) page and the file system specific page, such as mount_nfs(8)..." man mount_tmpfs (doesn't exist) and don't see a "size" option anywhere. oh... there it is man tmpfs > There was a nice Sun white paper by Peter Snyder on tmpfs. It's linked on > the Wikipedia tmpfs page, but Oracle has broken the link. Google has a > rendered version of a PostScript copy (long URL): > http://webcache.googleusercontent.com/search?q=cache:EXMeqvhFfrsJ:www.sun3arc.org/papers/OS/tmpfs_virtual_memory_filesystem.ps.gz+tmpfs+white+paper&cd=12&hl=en&ct=clnk&gl=us Thanks. Interesting, I would have thought swap space for something in a tmpfs was not allocated until it needed to be swapped out. As I read it, used tmpfs space reserves space in swap. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"