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Date: Tue, 28 Sep 2010 17:25:39 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Willem Jan Withagen <wjw@digiware.nl>
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Cc: stable@freebsd.org, fs@freebsd.org,
	Jeremy Chadwick <freebsd@jdc.parodius.com>
Subject: Re: Still getting kmem exhausted panic
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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