Many thanks, I have also gathered from a couple of vendors that they have experienced a problem in getting IDE and SATA working to an opterons with more than 4GB of memory. One theory is that quite a number of IDE and SATA controllers are still running 32-bit codes. Peter -----Original Message----- From: Joshua Baker-LePain [mailto:jlb17@xxxxxxxx] Sent: 31 March 2004 18:12 To: redhat-list@xxxxxxxxxx Cc: Chiu, PCM (Peter) Subject: physical memory support under RHEL for Opteron On Wed, 31 Mar 2004 at 12:00pm, redhat-list-request@xxxxxxxxxx wrote > I am just about to order an dual Opteron 248 server to run under RHEL > AS. > > I would like to double check the physical memory supported - we are > getting 8 x 2GB PC3200 or PC2700 memory on this server. > > I have found something a bit obscure on the RH web page: > http://www.redhat.com/software/rhel/as/ > <http://www.redhat.com/software/rhel/as/> > > in that it said: > > ** 64GB is the maximum memory size for X86 systems. Maximum memory > sizes vary with other architectures. > > Can anyone confirm > a. the maximum memory size for Opterons supported, and > b. the maximum usable physical memory per process on user applications >From /usr/src/linux-2.4.21-9.EL/Documentation/x86_64/mm.txt on my RHEL3.0 AMD64 system: The paging design used on the x86-64 linux kernel port in 2.4.x provides: o per process virtual address space limit of 512 Gigabytes o top of userspace stack located at address 0x0000007fffffffff o start of the kernel mapping = 0x0000010000000000 o global RAM per system 508*512GB=254 Terabytes o no need of any common code change o 512GB of vmalloc/ioremap space So I think you're OK with 16GB. ;) FWIW, that systems has 8GB and runs wonderfully. Be sure to follow the recommendations in bugs 118152 and 115438, which fix a couple of memory issues. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
