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Date: Thu, 20 Sep 2007 23:01:21 +0200
From: Kris Kennaway <kris@FreeBSD.org>
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To: Borja Marcos <BORJAMAR@SARENET.ES>
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Cc: freebsd-current@freebsd.org, Ivan Voras <ivoras@freebsd.org>
Subject: Re: Memory allocation problems (ZFS/NFS/amd64)
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Borja Marcos wrote:
> 
> On 20 Sep 2007, at 10:37, Kris Kennaway wrote:
> 
>> Borja Marcos wrote:
>>> On 19 Sep 2007, at 19:35, Ivan Voras wrote:
>>>> Borja Marcos wrote:
>>>>
>>>>> These are not innocuous messages, the machine is rejecting connections
>>>>> like crazy. Any ideas?
>>>>> The number of established TCP connections was around 490, and the
>>>>> machine has 2 GB of RAM.
>>>>
>>>> Just a guess: what is your vm.kmem_size_max and have you tried
>>>> increasing it?
>>> It's the first thing I thought, and I cranked it to a very high value 
>>> just in case:
>>> vm.kmem_size_max: 1073741824
>>
>> You actually wanted to tune vm.kmem_size too or it may not actually 
>> change the value used (_max is just a ceiling for autotuning).  
>> However if this is i386 you can't set it that high without also 
>> adjusting KVA_PAGES too (which has other effects).
> 
> It's an amd64. I understand that i386 is mostly out of the question if I 
> want to play reasonably safe with ZFS :)
> 
> Oh, ok. I will try with both, then. Should I try the same value? Perhaps 
> it's a bit high, but I understand that with a 64 bit address space I can 
> set it sort of arbitrarily high without many side effects.

Yes, you should set them both to the same value.

Kris