Date: Fri, 12 Feb 2010 10:47:40 -0800 From: Artem Belevich <fbsdlist@src.cx> To: Steve Polyack <korvus@comcast.net> Cc: freebsd-fs@freebsd.org, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: ZFS ARC being limited below what is defined in /boot/loader.conf Message-ID: <ed91d4a81002121047y18c6c627td9a7797164ba050a@mail.gmail.com> In-Reply-To: <4B759E70.4030809@comcast.net> References: <4B759E70.4030809@comcast.net>
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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 On Fri, Feb 12, 2010 at 10:31 AM, Steve Polyack <korvus@comcast.net> wrote: > Has anyone had an issue with the ZFS ARC max being limited below what has > been defined in /boot/loader.conf? =A0I just upgraded the RAM in a > ZFS-equipped system and attempted to devote 4GB to the ARC cache by placi= ng > the following in loader.conf: > =A0vfs.zfs.arc_max=3D"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. =A0For > reference, I'm running 8-STABLE (as of Jan 19th) on an amd64 system with = 8GB > of RAM. =A0The system was previously very stable with 4GB of RAM and a 51= 2MB > arc_max. =A0I have not modified vm.kmem_size_max (defaults to ~330GB on a= md64) > or any other ZFS tunables. =A0I'd also like to avoid syncing up to the cu= rrent > 8-STABLE if at all possible. > > Thanks, > Steve Polyack > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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