Date: Tue, 24 Nov 2009 15:24:07 +0100 From: Ollivier Robert <roberto@keltia.freenix.fr> To: freebsd-fs@freebsd.org Subject: Re: 7.2 dies in zfs Message-ID: <20091124142407.GD81894@roberto-al.eurocontrol.fr> In-Reply-To: <4B0BD5E7.3050604@freebsd.org> References: <m2my2hkj2y.wl%randy@psg.com> <20091122154228.GB55532@rron.freenix.org> <4B0BD5E7.3050604@freebsd.org>
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According to Stefan Esser: >If your i386 based system has much RAM (2GB or more), than you >should definitely increase KVA_PAGES. Not doing so will lead to >panics, not in spite of but exactly because of the large RAM. I have uppped KVA_PAGES of course but this is reducing the amount of memory available to processes. If you define KVA_PAGES to 2GB for example, every process will be able to use only the remaining 2 GB for their own memory so there is a trade off there. >I have been using ZFS on i386 since it became available, first for >testing and soon as only file-system (with UFS boot, initially, now >switching over to gptzfsboot). Systems range from Pentium-3 to >AMD64x2 and I see no problems even under significant load. I've found that load is not a factor (if one defines load as many concurrent processes). The machine is mostly idle and I've seen panics coming from a "cvs update" or a "svn up". There are I/O intensive but not that much whereas the same machine can survive a buildworld just fine. The machine I have is a dual Xeon @2.8 GHz with 4 GB of RAM and 200 GB of disk. /boot/loader.conf ----- #-- limits kern.maxdsiz="1024M" kern.maxssiz="256M" kern.dfldsiz="1024M" kern.dflssiz="128M" #-- vm tuning vm.kmem_size="1024M" vm.kmem_size_max="1224M" vfs.zfs.arc_max="128M" vfs.zfs.prefetch_disable=1 ----- options KVA_PAGES=384 # 1.5GB of KVA -- Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr In memoriam to Ondine : http://ondine.keltia.net/
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