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From: Andrea Suisani <sickpig@opinioni.net>
To: Claudio Freire <klaussfreire@gmail.com>
Cc: Craig James <cjames@emolecules.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Two identical systems, radically different performance
Date: Mon, 15 Oct 2012 17:56:07 +0200
Message-ID: <507C3217.6040905@opinioni.net> (raw)
In-Reply-To: <CAGTBQpbt6sFkbGqELBzesTuz=v=iY3NQPdf+_AppfN7KNzkJEQ@mail.gmail.com>
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	<5076DA4E.80504@opinioni.net>
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	<507C2ACA.3020503@opinioni.net>
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On 10/15/2012 05:28 PM, Claudio Freire wrote:
> On Mon, Oct 15, 2012 at 12:24 PM, Andrea Suisani <sickpig@opinioni.net> wrote:
>>> It does prove they're not equivalent though.
>>>
>>
>> sure you're right.
>>
>> It's just that my bet was on a higher throughput
>> when HT was isabled from the BIOS (as you stated
>> previously in this thread).
>
> Yes, mine too. It's bizarre. If I were you, I'd look into it more
> deeply. It may be a flaw in your test methodology (maybe you disabled
> the wrong cores?).

this is the first thing I thought after looking at the results
but I've double-checked cores topology (core_id, core_siblings_list end
friends under /sys/devices/system/cpu/cpu0/topology) and I seems
to me that I've disabled the right ones.

It could be that I've messed up with something else...

 > If not, it would be good to know why the extra TPS
> to replicate elsewhere.

definitely I will try to understand the
probable causes performing other tests...
any hints are welcome :)


>





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