Re: New Opteron box, dedicated to PostgreSQL

Jan Mikkelsen wrote:
> Hi,
>
> Axel Rau wrote:
>  
>   
>> 1. Are there any precautions in fbsd to prevent from excessive page  
>> switching between the memory nodes?
>>     E.g. what happens if file cache pages (heavily used by Pg,  
>> planned 6GB) frequently not found on local node?
>>     
>
> Not that I'm aware of.  FreeBSD doesn't have NUMA awareness.
>   
FreeBSD does not support this. I've been working on the scheduler side 
of things, but I do not understand the VM well enough to do that side of it.
>   
>> 2. If there is no good solution for this problem, does it make sense  
>> to stay with one dualcore (soon quadcore) processor?
>>     
No. 2 memory controllers beats 1, even with the remote penalty occuring.

The difference either way will be fairly trivial, though.
>
> Benchmark and see.
>
>   
>> 4. Can I install the system on an Areca raid?
>>     
>
> Yes.  If you are planning to use 6.2-RELEASE, make sure that you get the
> arcmsr driver from 6-STABLE.  The arcmsr driver in 6.2-RELEASE can show
> I/O errors under high load.
>
> Regards,
>
> Jan Mikkelsen
>
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