[LUAU] goofy RAM question

[Jim Thompson]

Which architecture ISO did you load (i386?  x86-64?  ia64?)    
Hopefully you've loaded CentOs x86-64 4.1.

Under the 'x86' architecture (32 bit), the system can only address 4  
GB of allocated memory. Allocated memory is made up of physical ram,  
and any I/O space needed by devices.  The I/o space is allocated  
starting at 4GB then working down.  One limitation is that the  
boundry must be on a power of two, so you get 4 GB minus a power of  
two big enough for the kernel-reserved I/O areas.

gonzo:~ jim$ echo "(2^32-(3504968*1024))/1024" | bc -l
689336.00000000000000000000

If you have loaded x86-64, then I have no idea what might be wrong.

If you loaded x86, then the fix is simple...  :-)

jim

On Jul 28, 2005, at 6:56 PM, Charles Lockhart wrote:

> The question is probably goofy, not the ram.
>
> I just installed 4GB of RAM on a Dell Precision 450 running  
> CentOS4  (dual Xeon P4 workstation).  The BIOS reports seeing all  
> of it, but when I run "cat /proc/meminfo"  I see number that don't  
> see quite right for the MemTotal.  Is the OS really not seeing the  
> RAM, or is is it just listed differently?  I remember something  
> about a kernel limitation at around 4GB, and there was a special  
> kernel for running with gt 4GB, but now the threshold seems to be  
> 16GB, it seems like 4GB wouldn't cause a problem.
>
> I got the memory from Kingston, via their RAM selector web  
> interface guide, so it's the right memory for the machine.  I just  
> don't see why it's not all showing up (my other Dell with FC2 on it  
> and having 512MB of RAM shows memtotal as 515372 kB, which while  
> not exactly 512MB, seems pretty close).
>
> [sw at nsf2pc ~]$ cat /proc/meminfo
> MemTotal:      3504968 kB
> MemFree:       3287304 kB
> Buffers:         13948 kB
> Cached:         122292 kB
> SwapCached:          0 kB
> Active:          84376 kB
> Inactive:        98208 kB
> HighTotal:     2620884 kB
> HighFree:      2444352 kB
> LowTotal:       884084 kB
> LowFree:        842952 kB
> SwapTotal:     6144852 kB
> SwapFree:      6144852 kB
> Dirty:             136 kB
> Writeback:           0 kB
> Mapped:          59532 kB
> Slab:            20292 kB
> Committed_AS:    94336 kB
> PageTables:       1672 kB
> VmallocTotal:   106488 kB
> VmallocUsed:      5368 kB
> VmallocChunk:   100996 kB
> HugePages_Total:     0
> HugePages_Free:      0
> Hugepagesize:     2048 kB
> [sw at nsf2pc ~]$
>
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