Date: Mon, 18 Mar 2013 14:48:39 -0700 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: olli hauer <ohauer@gmx.de> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD is very slow when Memory chip sizes are imbalanced in slots Message-ID: <CAOgwaMu8Jyqf-ni3BTKCOYBmBtnkNNuDt4sN0LWR=G=Xbk7vCw@mail.gmail.com> In-Reply-To: <51478703.7030907@gmx.de> References: <CAOgwaMss0cB9bFqCkjzukb-=9FqgLN9vthL5QdQsk-6Lknk5VQ@mail.gmail.com> <CAOgwaMtTmx4LhEdrg3WNjZA-uyTRSN913RBWrrqMia4GZhP_zA@mail.gmail.com> <CAFHbX1KkD7fWP%2BKZNrSjzCStUM_Smjw7GdKDTo=DjjMoe5ttGA@mail.gmail.com> <35878.1363607691@critter.freebsd.dk> <CAOgwaMthTbj5k%2B03WSNGK7wm0aTufd1czQotM1wF0mAVnU7HLQ@mail.gmail.com> <514715F9.2080506@freebsd.org> <D09D34E518E94C3CAC98DAE7486CE62A@multiplay.co.uk> <CAOgwaMvsoa=TWebXq14VzvNrNQZuLg9Kr63-tmq8ZZ42%2B79mOQ@mail.gmail.com> <F5063459450D4CB4B15B9DC3F0EE27B1@multiplay.co.uk> <CAOgwaMtiPyvZvUj=XDUDVuuAJ%2BVvNtn9TQngQQn7q7grvz8=5Q@mail.gmail.com> <D956B1EE70984978BCB396A9796EAEDD@multiplay.co.uk> <CAOgwaMuuOK8qpQFVW-EFZc_kPzQkyrtPCUGuPL_tfgZJUrWK=A@mail.gmail.com> <43BD412145BF4C7A9E2EFF91CF2ED379@multiplay.co.uk> <CAOgwaMsbRezVAJB%2B-RyWPknjqhtg5yqwTWJK6xKXVuP3y_qGXQ@mail.gmail.com> <CACdU%2Bf8m7uuGrhR95HQ8K7fKre1xFL3=8w-89gsG24OFNNZGTQ@mail.gmail.com> <CAOgwaMt_5t1SgOA-gBi1KET_RVByS51J7Ymf-aBdbCj4dq-e-g@mail.gmail.com> <51478703.7030907@gmx.de>
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On Mon, Mar 18, 2013 at 2:28 PM, olli hauer <ohauer@gmx.de> wrote: > 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. > > > > These are worked : http://lists.freebsd.org/pipermail/freebsd-current/2012-February/031836.html http://lists.freebsd.org/pipermail/freebsd-current/2012-February/031912.html http://lists.freebsd.org/pipermail/freebsd-current/2012-February/031928.html http://lists.freebsd.org/pipermail/freebsd-current/2012-February/032012.html It seems that memory chip sizes are not checked one by one or used per chip in slots , but a COMMON value is used : Size of chip in first slot . When size of chip in second slot is smaller than size of chip in first slot , problem appears . Thank you very much . Mehmet Erol Sanliturk
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