Date: Fri, 17 Mar 2006 09:09:42 -0300 From: JoaoBR <joao@matik.com.br> To: Martin Nilsson <martin@gneto.com> Cc: freebsd-amd64@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: amd64 slower than i386 on identical AMD 64 system? Message-ID: <200603170909.42622.joao@matik.com.br> In-Reply-To: <441A4DAB.4030800@gneto.com> References: <200603140740.38388.joao@matik.com.br> <200603161705.17351.joao@matik.com.br> <441A4DAB.4030800@gneto.com>
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On Friday 17 March 2006 02:48, Martin Nilsson wrote: > JoaoBR wrote: > > with 2GB no problem, > > 3GB I do not know but 4GB is when the problem appears here for me > > > >> Wonder if there is some sort of memory pairing issue. To get >2GB and > >> <4GB I'd think you have to have 2 1GB sticks and 2 512MB sticks or > >> something like that. > > > > no it isn't in my case, I use real good dual-channel 2x (2x1GB) > > suggested memory listed in the MB manual > > With 4GB memory you will likely get some memory remapped above 4GB, > could your problems be caused by a buggy driver that doesn't support > memory over the 4GB barrier correctly? (The ata driver comes to mind) > I thought this at the beginning, I got an answer from Asus and Epox support that the never Bios versions prevent this since the southbridge on Asus as example cuts some 300Mb already so I have this when using 4GB real memory = 3992649728 (3807 MB) avail memory = 3858542592 (3679 MB) there are also some rumors on some mailling lists that when using 4 double density DDR400 ram modules that the MB only recognizes them as DDR333 what I did not get confirmed anywhere, neither Asus nor Epox, that appearently has to do when people use not full qualified modules only there may be an issue using double density modules regarding dualchannel but the worse case that the memory module is not working as dual channel and the board should work normally. well, I do not use IDEs or SATAs and it seems the ahd driver is not affected I have a very small kernel and I do not even compile sio/lpt or any other unecessary stuff I use xl|sk|nve and the scsi driver only I just compiled a releng_6 i386 and will check this weekend one of this X2 machines to see what happens Joćo A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.brhome | help
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