On 02/12/10 13:47, Artem Belevich wrote:
On Fri, Feb 12, 2010 at 10:31 AM, Steve Polyack<[email protected]> wrote:
Has anyone had an issue with the ZFS ARC max being limited below what has
been defined in /boot/loader.conf? I just upgraded the RAM in a
ZFS-equipped system and attempted to devote 4GB to the ARC cache by placing
the following in loader.conf:
vfs.zfs.arc_max="4096M"
However, after rebooting, querying the sysctl gives me this:
$ sysctl vfs.zfs.arc_max
vfs.zfs.arc_max: 1726489600
or about 1.7GB, an odd number that I can't find any references to. For
reference, I'm running 8-STABLE (as of Jan 19th) on an amd64 system with 8GB
of RAM. The system was previously very stable with 4GB of RAM and a 512MB
arc_max. I have not modified vm.kmem_size_max (defaults to ~330GB on amd64)
or any other ZFS tunables. I'd also like to avoid syncing up to the current
8-STABLE if at all possible.
Thanks,
Steve Polyack
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Check your vm.kmem_size. Default setting is way too low. Set it to at
least double of desired arc size.
--Artem
I mentioned it briefly, but vm.kmem_size_max was left at the default for
amd64. At 330GB it is way above and beyond what will ever be allocated
to ARC:
$ sysctl vm.kmem_size_max
vm.kmem_size_max: 329853485875
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