I really appreciate everyones feedback on this. I'll do some more
experiments next week, what's most important to me is that I can create a
box that has 8G and 16G usable, I'll just have to do reboots to find out
what the correct mem= is for each.
-Tim
On Fri, Sep 13, 2013 at 11:50 PM, Bill
On Fri, Sep 13, 2013 at 10:10:07PM -0400, Richard Pieri wrote:
Some Googling about lead me to the PCI memory hole:
http://en.wikipedia.org/wiki/PCI_hole
Short version: in order to boot 32-bit operating systems the BIOS or
EFI firmware needs to map all PCI devices to the first 4GB of
address
Bill Bogstad wrote:
On my system, they both provide identical info (If you look at the
right field):
Mine usually do but I recall seeing some exceptions. free does some
interesting rounding if you use the -g or -m switches.
--
Rich P.
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Then I suspect that you have some devices using a chunk of your system
RAM. For example, something like a shared RAM IGP.
--
Rich P.
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Discuss@blu.org
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Dell documentation, for example, has been known to say some of its PC's
hardware will eat a certain amount of RAM that you will never have access
to for user space. You may want to review the docs of your system to see
if it has a similar claim (m/b, video card, etc).
Scott
On Fri, Sep 13,
Ugh, this is frustrating. I asked for 8192M (8G), but ended up with 5.79G.
*I booted using this section from /etc/grub.conf:*
title CentOS (2.6.18-348.3.1.el5) 8G
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-348.3.1.el5 ro root=LABEL=/ mem=8192M
initrd /boot/initrd-2.6.18-348.3.1.el5.img
*and here
On Fri, Sep 13, 2013 at 12:12 PM, Tim Callaghan tmcallag...@gmail.com wrote:
Ugh, this is frustrating. I asked for 8192M (8G), but ended up with 5.79G.
*I booted using this section from /etc/grub.conf:*
title CentOS (2.6.18-348.3.1.el5) 8G
root (hd0,0)
kernel
Bill Bogstad wrote:
I think you should do a reboot, capture the output of dmesg (dmesg
foo), and see what the kernel is saying about memory.
No, I think Scott nailed it. I checked a couple of my Dell servers. Sure
enough, the kernels report less RAM than is physically installed.
--
Rich
Bill Bogstad wrote:
It would still be nice to know where the memory is being used.
Some Googling about lead me to the PCI memory hole:
http://en.wikipedia.org/wiki/PCI_hole
Short version: in order to boot 32-bit operating systems the BIOS or EFI
firmware needs to map all PCI devices to the
Tim Callaghan wrote:
What am I missing?
free tells you what's available, not what's actually detected, for a
variety of reasons. What you really want is the first line of /proc/meminfo.
head -1 /proc/meminfo
That will tell you precisely how much real, physical memory the kernel
detects.
I'm trying to reduce the amount of available memory on a Dell R710. It has
48GB installed, I want to be able to boot it with 8G and 16G for some of my
benchmarks.
I've modified my /etc/grub.conf file, copying the top section and adding to
the end of the kernel line as follows:
kernel
On Thu, Sep 12, 2013 at 7:58 PM, Richard Pieri richard.pi...@gmail.com wrote:
Tim Callaghan wrote:
What am I missing?
free tells you what's available, not what's actually detected, for a variety
of reasons. What you really want is the first line of /proc/meminfo.
head -1 /proc/meminfo
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