It does. Thank you very much for replying. John
> -----Original Message----- > From: gabriel [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, January 21, 2003 11:31 AM > To: [EMAIL PROTECTED] > Subject: Re: Max amount of RAM in 7.2 question > > > from the kernel config menu system: > > <stuff> > 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". > > </stuff> > > so i guess if you compile your own kernel *with* himem > support, you should be > able to use up to 64gb of ram (wow). > > ...hope that helps > > > > > On January 21, 2003 11:09 am, Robert Adkins wrote: > > John, > > > > I believe, like in Windows, you need to have specific > support for High > > Memory Architecture (HMA) when using Intel 32-bit > Processors, which is > > what I believe is in your Compaq Proliant. > > > > You will likely have to compile a custom Linux Kernel > to support that > > High Memory Architecture. Unfortunately, I cannot say for > sure as I have > > never had the opportunity to work with such equipment, I > have only read > > about such hardware. > > > > I believe you could get an answer as to how to > configure a kernel for > > your HMA equipment on a kernel mailing list. > > > > Regards, > > Robert Adkins II > > IT Manager/Buyer > > Impel Industries, Inc. > > Ph. 586-254-5800 > > Fx. 586-254-5804 > > > > > > -----Original Message----- > > From: Turner, John [mailto:[EMAIL PROTECTED]] > > Sent: Tuesday, January 21, 2003 10:18 AM > > To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; > Robert Adkins > > Subject: Max amount of RAM in 7.2 question > > > > > > > > > > Greetings - > > > > I've scoured Google and redhat.com most of the morning for > a specific > > answer, but haven't found it. Hopefully someone here will have it. > > > > I have a Compaq ProLiant server with RH 7.2 SMP > (2.4.9-31smp kernel). Up > > until this morning, it had 1.25 GB of RAM. This morning I > installed 6 GB > > RAM, replacing the existing 1.25 GB. The hardware supports > 6 GB, and 6 > > GB > > shows up fine in the BIOS POST. > > > > However, dmesg, /proc/meminfo, and "free -m" shows that > only 4 GB was > > picked > > up when the server was restarted. > > > > Is 4 GB a hard maximum limit for 7.2? Is there a hard > maximum limit, and > > if > > so, what is it? > > > > I did find something on redhat.com that said I could use > "mem=XXM" at > > boot > > to tell the kernel that there is 6 GB there and not just 4. Is that > > correct? I would pass "mem=6144M" to the kernel at boot? > > > > - John > > > > ============================================ > > John Turner > > [EMAIL PROTECTED] | 248-488-3466 > > Advertising Audit Service > > http://www.aas.com > > > > -- > 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
