Date: Fri, 12 Feb 2010 13:31:12 -0500 From: Steve Polyack <korvus@comcast.net> To: freebsd-stable <freebsd-stable@FreeBSD.org>, freebsd-fs@freebsd.org Subject: ZFS ARC being limited below what is defined in /boot/loader.conf Message-ID: <4B759E70.4030809@comcast.net>
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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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