On 29/04/2011, at 11:43, Artem Belevich wrote: > 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.
This system also does double duty as a desktop PC so it gets a fair hammering.. It did have 4GB of RAM but that was fairly terrible, 8GB is a lot better though :) -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C _______________________________________________ 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"
