On 11/21/06, Bithika Khargharia <bithika@xxxxxxxxx> wrote:
Thanks Fawad, On 11/18/06, Fawad Lateef <fawadlateef@xxxxxxxxx> wrote: > Your complete system information to know will be good for better > understanding of your ptoblem. Means output of 'uname -a' and > processor/motherboard model. > uname -a gives Linux dhcp-233.ece.arizona.edu 2.6.18 #131 SMP Fri Nov 17 16:38:34 MST 2006 i686 i686 i386 GNU/Linux.I have dual core Intel xeon processor and the motherboard is Intel(r) Server Board S5000PAL > I can't say exactly what is happening on your side, might be some > in-compatiblity of your motherboard (bios) with Linux Kernel. But the > thing which you can see is: point 8. Total usable pfns = 2070237 = > ~8GB memory, so might possible your bios is telling IO-Devices mapped > region as some more memory available (but I am not sure about this). That's a good point. Also with total usable pfns = 2070237 and last usable pfn 2490368 there must be some PFNs in between that are IO-Devices mapped as you mentioned perhaps.
Yes, this might be the case. Try google for your possible bios related issues.
> Have you tried to read/write/kmap on pages whose pfns are giving > physical address after 8GB ? Is it working ? and what memory size 'cat > /proc/meminfo' is mentioning ? No I have not. I will try that and let you know what happens. cat /proc/meminfo actually gives MemTotal: 8280948 kB !!
This means Linux/Kernel actually knows ~8GB memory so will use only 8GB, now as I said might be your memory mapped IO devices is also counted in your total_pfns. Someone might give more/correct details
> Its better is you also do CC to kernelnewbies, so that some other > person might give you some better idea too. And please don't do > top-posting, rather do bottom-posting (search google for it) on > mailing-list while replying. Thanks Fawad or introducing me to the lists' netiquettes
No problem :) -- Fawad Lateef -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
