Still getting kmem exhausted panic

[Willem Jan Withagen]

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On 28-9-2010 16:25, Andriy Gapon wrote:
> 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.

So in my case (no other serious apps) with 12G phys mem:

vm.kmem_size=17G
vfs.zfs.arc_max=11G

- --WjW

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