On Thu, Apr 28, 2011 at 6:08 PM, Jeremy Chadwick <free...@jdc.parodius.com> wrote: > I will note something, however: your ARC max is set to 3072MB, yet Wired > is around 4143MB. Do you have something running on this box that takes > up a lot of RAM? mysqld, etc..? I'm trying to account for the "extra > gigabyte" in Wired. "top -o res" might help here, but we'd need to see > the process list. > > I'm thinking something else on your machine is also taking up Wired, > because your arcstats shows: > >> kstat.zfs.misc.arcstats.c: 3221225472 >> kstat.zfs.misc.arcstats.c_min: 402653184 >> kstat.zfs.misc.arcstats.c_max: 3221225472 >> kstat.zfs.misc.arcstats.size: 3221162968 > > Which is about 3072MB (there is always some degree of variance).
The difference is probably due to fragmentation (most of ARC allocations are served from power-of-2 zones, if I'm not mistaken) + a lot of wired memory sits in slab allocator caches (FREE column in vmstat -z). On a system with ARC size of ~16G I regularly see ~22GB wired. Ona smaller box I get about 7GB wired at around 5.5GB ARC size. --Artem _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
