Thanks...informative.<br><br>Asaf<br><br><br><div class="gmail_quote">On Jan 22, 2008 4:16 PM, Lennart Sorensen <<a href="mailto:lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys@public.gmane.org">lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys@public.gmane.org</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">On Tue, Jan 22, 2008 at 04:06:00PM -0500, Asaf Maruf wrote:<br>> Hello<br>><br>> What is the maximum memory supported by the current Linux kernel? Will i<br>> have to use the HUGEMEM kernel for a large memory configuration of 64G+ or
<br>> 128G+.<br><br></div>If you use x86 (i386-i686/k7/etc) then you need HIGHMEM4GB if you<br>have more than 900MB, you need HIGHMEM64GB if you have more than about<br>3GB ram (basically if you have any memory mapped higher than 4GB address).
<br>x86 32bit can't addres more than 64GB no matter what you do.<br><br>If you run amd64 (x86_64) then you don't have to worry about it.<br>Maximum address range is at least 40bit on Opterons, while at least some<br>
Xeon's were limited to 36bit (64GB). Not sure what the current physical<br>address range on the modern Xeons is now. I see IBM says one of their<br>Xeon servers can run 512GB so that would be at least 39bit.<br><br>
So if the machine is 64bit capable, and can accept that much ram, then<br>32bit linux with HIGHMEM64G can use about 63GB of the ram. 64bit linux<br>can use all of it with the standard config, since it doesn't have any
<br>settings for memory space.<br><br>--<br>Len Sorensen<br><font color="#888888">--<br>The Toronto Linux Users Group. Meetings: <a href="http://gtalug.org/" target="_blank">http://gtalug.org/</a><br>TLUG requests: Linux topics, No HTML, wrap text below 80 columns
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