Date: Tue, 28 Sep 2010 17:25:39 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Willem Jan Withagen <wjw@digiware.nl> Cc: stable@freebsd.org, fs@freebsd.org Subject: Re: Still getting kmem exhausted panic Message-ID: <4CA1FAE3.9090200@icyb.net.ua> In-Reply-To: <4CA1F6FD.5090807@digiware.nl> References: <4CA1D06C.9050305@digiware.nl> <20100928115047.GA62142@icarus.home.lan> <4CA1ECCC.4070801@digiware.nl> <4CA1F1B4.1020700@icyb.net.ua> <4CA1F570.6000602@digiware.nl> <4CA1F6A0.20109@icyb.net.ua> <4CA1F6FD.5090807@digiware.nl>
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on 28/09/2010 17:09 Willem Jan Withagen said the following: > On 28-9-2010 16:07, Andriy Gapon wrote: >> on 28/09/2010 17:02 Willem Jan Withagen said the following: >>> I do have (read) this document, but still that doesn't really give you >>> guidelines for tuning on FreeBSD. It is a fileserver without any serious >>> other apps. >>> I was using "auto-tuned", and that crashed my box. That is what started >>> this whole thread. > >> Well, as I've said, in my opinion FreeBSD-specific tuning ends at setting kmem size. > > > I consider that a useful statement. Hm, looks like I've just given a bad advice. It seems that auto-tuned arc_max is based on kmem size. So if you use kmem size that is larger than available physical memory, then you better limit arc_max to the available memory minus 1GB or so, if the autotuned value is larger than that. I think this needs to be fixed in the code. -- Andriy Gapon
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