Re: ZFS vs OSX Time Machine
- From: "Daniel O'Connor" <doconnor@xxxxxxxxxxxx>
- Date: Fri, 29 Apr 2011 12:09:59 +0930
On 29/04/2011, at 11:43, Artem Belevich wrote:
On Thu, Apr 28, 2011 at 6:08 PM, Jeremy Chadwick
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:
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
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