Date: Wed, 19 May 2010 11:47:02 +0200 From: Matthias Gamsjager <mgamsjager@gmail.com> To: Arnaud Houdelette <tzim@tzim.net> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS Recordsize tuning & transmission (bittorent daemon) Message-ID: <AANLkTimO9KkPQGbZNEPcTScxtdipLaB1hMZpjDSkvIsw@mail.gmail.com> In-Reply-To: <4BF3AE24.9080605@tzim.net> References: <4BF3A0DD.4080404@tzim.net> <AANLkTilnb_F-mi8ak42Ql3Aipxrn52dddFQNPX9en4_J@mail.gmail.com> <4BF3AE24.9080605@tzim.net>
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> cat /boot/loader.conf > ahci_load="YES" > zfs_load="YES" > vfs.root.mountfrom="zfs:unsafe/root" > #vm.kmem_size="512M" > vm.kmem_size_max="512M" > vfs.zfs.arc_max="150M" > vfs.zfs.arc_min="64M" > vfs.zfs.vdev.cache.size="10M" > vfs.zfs.prefetch_disable="0" Your on AMD64, try to remove all zfs stuff in loader.conf. Try the default and see how it works out. How did you come up with these settings anyway? > Bad performance IS expected on this hardware. This is a home NAS, and the > "unsafe" pool is on a laptop 2.5" IDE drive. > Still, bad performance would'nt explain the discrepancies between read and > write stats (both in zpool io stat and gstat). > >> did you test your pool with Iozone to see if it performance as it should? >> >> > > I did not. I just installed the port. What test should I run to get relevant > data ? iozone -r 128k -s 4g -t1 -x should do the trick.
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