Excellent. Thank you for replying! John
> -----Original Message----- > From: Bret Hughes [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, January 21, 2003 11:58 AM > To: [EMAIL PROTECTED] > Subject: RE: Max amount of RAM in 7.2 question > > > On Tue, 2003-01-21 at 10:19, Turner, John wrote: > > > > Ugh. I hope not. I wonder why a motherboard would support > 6 GB, then. > > I've never worked with Linux with more than 2GB, so I've > never run into this > > issue before. Machines that have had 4 or 8 GB (or more) > of RAM for me have > > always been Solaris or AIX boxes. > > > > John > > seems like I remember reading that there is a config option > for 64GB of > memory during kernel configuration.... yep. from the > DOocumentation/Configure.help file in the source tree: > > > High Memory support > CONFIG_NOHIGHMEM > Linux can use up to 64 Gigabytes of physical memory on x86 systems. > However, the address space of 32-bit x86 processors is only 4 > Gigabytes large. That means that, if you have a large amount of > physical memory, not all of it can be "permanently mapped" by the > kernel. The physical memory that's not permanently mapped is called > "high memory". > > If you are compiling a kernel which will never run on a machine with > more than 960 megabytes of total physical RAM, answer "off" here > (default > choice and suitable for most users). This will result in a "3GB/1GB" > split: 3GB are mapped so that each process sees a 3GB virtual memory > space and the remaining part of the 4GB virtual memory space is used > by the kernel to permanently map as much physical memory as > possible. > > If the machine has between 1 and 4 Gigabytes physical RAM, then > answer "4GB" here. > > If more than 4 Gigabytes is used then answer "64GB" here. This > selection turns Intel PAE (Physical Address Extension) mode on. > PAE implements 3-level paging on IA32 processors. PAE is fully > supported by Linux, PAE mode is implemented on all recent Intel > processors (Pentium Pro and better). NOTE: If you say "64GB" here, > then the kernel will not boot on CPUs that don't support PAE! > > The actual amount of total physical memory will either be auto > detected or can be forced by using a kernel command line option such > as "mem=256M". (Try "man bootparam" or see the documentation of your > boot loader (grub, lilo or loadlin) about how to pass options to the > kernel at boot time.) > > If unsure, say "off". > > My guess is that there is no precompiled binary kernel that > sets this to > 64GB since the number of folks that use it would be way limited. > > HTH > > Bret > > > > -- > redhat-list mailing list > unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe > https://listman.redhat.com/mailman/listinfo/redhat-list > -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe https://listman.redhat.com/mailman/listinfo/redhat-list
