From owner-freebsd-current@FreeBSD.ORG  Mon Mar 18 21:27:55 2013
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by hub.freebsd.org (Postfix) with ESMTP id 57C90389
 for <freebsd-current@freebsd.org>; Mon, 18 Mar 2013 21:27:55 +0000 (UTC)
 (envelope-from ohauer@gmx.de)
Received: from mout.gmx.net (mout.gmx.net [212.227.17.20])
 by mx1.freebsd.org (Postfix) with ESMTP id C4ABBC36
 for <freebsd-current@freebsd.org>; Mon, 18 Mar 2013 21:27:54 +0000 (UTC)
Received: from mailout-de.gmx.net ([10.1.76.10]) by mrigmx.server.lan
 (mrigmx002) with ESMTP (Nemesis) id 0Lewz3-1V4I5x22ql-00qmfY for
 <freebsd-current@freebsd.org>; Mon, 18 Mar 2013 22:27:50 +0100
Received: (qmail invoked by alias); 18 Mar 2013 21:27:50 -0000
Received: from p578be941.dip0.t-ipconnect.de (EHLO [192.168.0.100])
 [87.139.233.65]
 by mail.gmx.net (mp010) with SMTP; 18 Mar 2013 22:27:50 +0100
X-Authenticated: #1956535
X-Provags-ID: V01U2FsdGVkX18Z7NJgLaUZfIA3MhqDfphftCueNz8eU/P6bAj8ic
 nZX3Y+dLIHJGMj
Message-ID: <51478703.7030907@gmx.de>
Date: Mon, 18 Mar 2013 22:28:35 +0100
From: olli hauer <ohauer@gmx.de>
User-Agent: Mozilla/5.0 (Windows NT 5.1;
 rv:17.0) Gecko/20130307 Thunderbird/17.0.4
MIME-Version: 1.0
To: freebsd-current@freebsd.org
Subject: Re: FreeBSD is very slow when Memory chip sizes are imbalanced in
 slots
References: <CAOgwaMss0cB9bFqCkjzukb-=9FqgLN9vthL5QdQsk-6Lknk5VQ@mail.gmail.com>
 <CAOgwaMtTmx4LhEdrg3WNjZA-uyTRSN913RBWrrqMia4GZhP_zA@mail.gmail.com>
 <CAFHbX1KkD7fWP+KZNrSjzCStUM_Smjw7GdKDTo=DjjMoe5ttGA@mail.gmail.com>
 <35878.1363607691@critter.freebsd.dk>
 <CAOgwaMthTbj5k+03WSNGK7wm0aTufd1czQotM1wF0mAVnU7HLQ@mail.gmail.com>
 <514715F9.2080506@freebsd.org>
 <D09D34E518E94C3CAC98DAE7486CE62A@multiplay.co.uk>
 <CAOgwaMvsoa=TWebXq14VzvNrNQZuLg9Kr63-tmq8ZZ42+79mOQ@mail.gmail.com>
 <F5063459450D4CB4B15B9DC3F0EE27B1@multiplay.co.uk>
 <CAOgwaMtiPyvZvUj=XDUDVuuAJ+VvNtn9TQngQQn7q7grvz8=5Q@mail.gmail.com>
 <D956B1EE70984978BCB396A9796EAEDD@multiplay.co.uk>
 <CAOgwaMuuOK8qpQFVW-EFZc_kPzQkyrtPCUGuPL_tfgZJUrWK=A@mail.gmail.com>
 <43BD412145BF4C7A9E2EFF91CF2ED379@multiplay.co.uk>
 <CAOgwaMsbRezVAJB+-RyWPknjqhtg5yqwTWJK6xKXVuP3y_qGXQ@mail.gmail.com>
 <CACdU+f8m7uuGrhR95HQ8K7fKre1xFL3=8w-89gsG24OFNNZGTQ@mail.gmail.com>
 <CAOgwaMt_5t1SgOA-gBi1KET_RVByS51J7Ymf-aBdbCj4dq-e-g@mail.gmail.com>
In-Reply-To: <CAOgwaMt_5t1SgOA-gBi1KET_RVByS51J7Ymf-aBdbCj4dq-e-g@mail.gmail.com>
X-Enigmail-Version: 1.5.1
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Y-GMX-Trusted: 0
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 18 Mar 2013 21:27:55 -0000

On 2013-03-18 21:43, Mehmet Erol Sanliturk wrote:
> On Mon, Mar 18, 2013 at 9:48 AM, Scot Hetzel <swhetzel@gmail.com> wrote:
> 
>> On Mon, Mar 18, 2013 at 11:06 AM, Mehmet Erol Sanliturk
>> <m.e.sanliturk@gmail.com> wrote:
>>> Computer A : Memory Chip Sizes : ( 2 GB , 1 GB , 2 GB , 1 GB ) : Working
>>> SLOW . FreeBSD A
>>> Computer B  : Memory Chip Sizes : ( 2 GB , 2 GB , 2 GB , 2 GB ) : Working
>>> FAST . FreeBSD B
>>>
>>> Interchange memory chips :
>>>
>>> Computer A : Memory Chip Sizes : ( 2 GB , 2 GB , 2 GB , 2 GB ) : Working
>>> FAST . FreeBSD A
>>> Computer B  : Memory Chip Sizes : ( 2 GB , 1 GB , 2 GB , 1 GB ) : Working
>>> SLOW . FreeBSD B
>>>
>>>
>>
>> What happens if you configure the memory as ( 2 GB , 2 GB , 1 GB , 1 GB )?
>>
>> --
>> DISCLAIMER:
>>
>> No electrons were maimed while sending this message. Only slightly bruised.
>>
> 
> 
> This can NOT be done  , because
> 
> Channel A : Slot 1 :
>                    Slot 2 :
> 
> Channel B : Slot 1 :
>                    Slot 2 :
> 
> ( Slot 1 , Slot 1 ) should be equivalent when chips inserted to both .
> ( Slot 2 , Slot 2 ) should be equivalent when chips inserted to both .
> 
> Thank you ver much .
> 

I suspect the BIOS does not detect the optimal timing for the "SLOW" RAM or
a RAM Module is running on a slower timing.

What happen if you test with only the 2GB or the 1GB modules (to identify possible CHIP issues).
How is the memory detected in the BIOS (timings ...) some newer BIOS can run manual tests to detect timing issues.