Date: Sat, 7 Apr 2007 23:24:14 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org, "Florian C. Smeets" <flo@kasimir.com>, ticso@cicely.de Subject: Re: ZFS committed to the FreeBSD base. Message-ID: <20070407212413.GK8831@cicely12.cicely.de> In-Reply-To: <20070407191517.GN63916@garage.freebsd.pl> References: <20070406025700.GB98545@garage.freebsd.pl> <20070407025644.GC8831@cicely12.cicely.de> <20070407131353.GE63916@garage.freebsd.pl> <4617A3A6.60804@kasimir.com> <20070407165759.GG8831@cicely12.cicely.de> <20070407180319.GH8831@cicely12.cicely.de> <20070407191517.GN63916@garage.freebsd.pl>
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On Sat, Apr 07, 2007 at 09:15:17PM +0200, Pawel Jakub Dawidek wrote: > On Sat, Apr 07, 2007 at 08:03:19PM +0200, Bernd Walter wrote: > > Now with 240M kmem it looks good, but I'm still unshure: > > kstat.zfs.misc.arcstats.c_min: 67108864 > > kstat.zfs.misc.arcstats.c_max: 188743680 > > kstat.zfs.misc.arcstats.size: 87653376 > > c_max seemed to be increasing with kmem, but I did compare it with a > > remebered value. > > Should be good with: > > vm.kmem_size: 251658240 > > But top shows wired memory which is roughly twice the size of > > arcstats.size, so I'm still worried about kmem exhaustion if ARC runs > > up to c_max. > > Since the c_min/c_max values also influence the available RAM for other > > purposes as well, can we have it at least a loader.conf tuneable? > > Just committed a change. You can tune max and min ARC size via > vfs.zfs.arc_max and vfs.zfs.arc_min tunnables. Thanks - I'd set c_max to 80M now and will see what happens, since I had such a panic again with 240M kmem. I'm a bit confused about the calculation as such. Lets asume a 4G i386 system. arg_c = 512M c_min = 512M c_max = 3G But isn't this KVA space, of which we usually can't have 3G on i386 without limiting userland to 1G? Even 512M KVA sounds very much on a i386, since 4G systems usually have more use for limited KVA. -- B.Walter http://www.bwct.de http://www.fizon.de bernd@bwct.de info@bwct.de support@fizon.de
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