Date: Mon, 23 Mar 2015 03:41:47 -0400 From: Brett Wynkoop <freebsd-arm@wynn.com> To: Peter Jeremy <peter@rulingia.com> Cc: freebsd-arm@freebsd.org Subject: Re: ZFS on RPi (was: zfs on BeagleBone) Message-ID: <20150323034147.476a6f3f@ivory.wynn.com> In-Reply-To: <20150321065346.GA64358@server.rulingia.com> References: <20150311130932.3493a938@ivory.wynn.com> <20150321065346.GA64358@server.rulingia.com>
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On Sat, 21 Mar 2015 17:53:46 +1100 Peter Jeremy <peter@rulingia.com> wrote: > panic: vm_fault: fault on nofault entry, addr: dd2f1000 > KDB: stack backtrace: > Uptime: 11m46s > Physical memory: 473 MB > Dumping 36 MB:sdhci_bcm0: DMA in use > > The tuning I did was: > vfs.zfs.arc_max="24M" > vfs.zfs.vdev.cache.size="5M" > Sorry for the delay. Other things have kept me from being as attentive to the arm list as I might like. It seems you did not tune vm.kmem_size. In my experience with smallish systems running FreeBSD with zfs that is mandatory. My 256M BBone has this: vm.kmem_size="256M" vm.kmem_size_max="256M" #vfs.zfs.arc_max="40M" #vfs.zfs.arc_max="64M" vfs.zfs.arc_max="24M" vfs.zfs.vdev.cache.size="5M" I strongly suggest setting vm.kmem_size to your real memory and do the same with vm.kmem_size_max. I came up with this after doing loads of reading for zfs on memory restricted systems. Remember by default zfs really wants at least 1GB main memory, and that is still tight, most references claim 2GB is the practical lower limit on x86. I have it running on an x86 box with 512MB, but could not make it run on 384MB on FreeBSD x86. -Brett -- wynkoop@wynn.com http://prd4.wynn.com/wynkoop/pgp-keys.txt 917-642-6925 929-272-0000 If cowardly and dishonorable men sometimes shoot unarmed men with army pistols or guns, the evil must be prevented by the penitentiary and gallows, and not by a general deprivation of a constitutional privilege. -Honorable J. A. Williams, Circuit Judge - Wilson v. State, 33 Ark. 557, 34 Am. Rep. 52 (1878).
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