Date: Tue, 8 Jan 2008 07:56:17 +0000 From: David Taylor <davidt@yadt.co.uk> To: Adam McDougall <mcdouga9@egr.msu.edu> Cc: freebsd-current@FreeBSD.org Subject: Re: Should we simply disallow ZFS on FreeBSD/i386? Message-ID: <20080108075616.GA21296@outcold.yadt.co.uk> In-Reply-To: <20080106233254.GE1138@egr.msu.edu> References: <4780D289.7020509@FreeBSD.org> <flqmbo$eac$1@ger.gmane.org> <4780E546.9050303@FreeBSD.org> <9bbcef730801060651y489f1f9bw269d0968407dd8fb@mail.gmail.com> <4780EF09.4090908@FreeBSD.org> <flr0ie$euj$1@ger.gmane.org> <47810BE3.4080601@FreeBSD.org> <4781227B.5020800@rcn.com> <47814EAB.70405@FreeBSD.org> <20080106233254.GE1138@egr.msu.edu>
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On Sun, 06 Jan 2008, Adam McDougall wrote: > > The amount of kmem required for a particular workload on any one machine can vary > alot. Believe it or not, it is one of my AMD64 systems that I had to increase kmem > to 1.6G to prevent kmem panics (it does some heavy nightly rsyncs); versus just > having kmem set to 1G on a i386 system that constantly serves out files to the > internet with various rsyncs running through the day. Note that you're probably running into an integer overflow in arc.c if vm.kmem_size is set to 1GB or higher on i386. As a result kstat.zfs.misc.arcstats.size won't grow above kstat.zfs.misc.arcstats.c_min... I posted to freebsd-fs about it, but haven't heard anything from pjd, yet. Sadly, after fixing that problem I started encountering the kmem_map too small panics. -- David Taylor
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