Ram Queery - Printable Version
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Ram Queery by Th3rmal on 02-05-2008 at 05:48 AM
Ok if my new computer has got 4gb of ram (2x2g) in dual channel mode, (keep in mind i have 32bit main OS) since my OS only reads 3.23 gb of my ram can i use the rest of that memory for linux?
RE: Ram Queery by Menthix on 02-05-2008 at 06:26 AM
If you take it out, place in in another pc, and run linux on that, yes. Otherwise, no.
RE: Ram Queery by Th3rmal on 02-05-2008 at 07:16 AM
so if i give 512mb of ram to linux, 512mb will be taken off xp, even though xp 32bit only reads 3.23gb and not 4gb
RE: Ram Queery by Rowan187 on 02-05-2008 at 07:30 AM
Holy god man, i actually REGISTERED for the forums to reply to this.. i really really hope you mean in a Virtual Machine... right? 
RE: Ram Queery by Th3rmal on 02-05-2008 at 08:48 AM
quote:
Originally posted by Rowan187
Holy god man, i actually REGISTERED for the forums to reply to this.. i really really hope you mean in a Virtual Machine... right?
yes most likely it will be a virtual machine
btw welcome to the forums Rowan187
RE: Ram Queery by ShawnZ on 02-05-2008 at 09:16 AM
quote:
Originally posted by rm rulz
yes most likely it will be a virtual machine (Smilie)
well if XP can only see 3.23GB, and the virtual machine is running under XP...
RE: Ram Queery by Th3rmal on 02-05-2008 at 09:18 AM
quote:ok i understand now
Originally posted by ShawnZ
quote:
Originally posted by rm rulz
yes most likely it will be a virtual machine (Smilie)
well if XP can only see 3.23GB, and the virtual machine is running under XP...
but if i install linux as an actual operating system then what?
RE: Ram Queery by ShawnZ on 02-05-2008 at 09:31 AM
quote:
Originally posted by rm rulz
quote:ok i understand now
Originally posted by ShawnZ
quote:
Originally posted by rm rulz
yes most likely it will be a virtual machine (Smilie)
well if XP can only see 3.23GB, and the virtual machine is running under XP...
but if i install linux as an actual operating system then what?
err, what do you think?
RE: Ram Queery by Th3rmal on 02-05-2008 at 09:44 AM
quote:im guessing that it uses the left over but i was asking for confirmation
Originally posted by ShawnZ
quote:
Originally posted by rm rulz
quote:ok i understand now
Originally posted by ShawnZ
quote:
Originally posted by rm rulz
yes most likely it will be a virtual machine (Smilie)
well if XP can only see 3.23GB, and the virtual machine is running under XP...
but if i install linux as an actual operating system then what?
err, what do you think?
RE: Ram Queery by NanaFreak on 02-05-2008 at 09:52 AM
how can you run XP and linux at the same time? to do this, you need to use 2 different computers. thats it you cant do it in the single machine
RE: Ram Queery by ShawnZ on 02-05-2008 at 10:05 AM
quote:
Originally posted by rm rulz
quote:im guessing that it uses the left over but i was asking for confirmation
Originally posted by ShawnZ
quote:
Originally posted by rm rulz
quote:ok i understand now
Originally posted by ShawnZ
quote:
Originally posted by rm rulz
yes most likely it will be a virtual machine (Smilie)
well if XP can only see 3.23GB, and the virtual machine is running under XP...
but if i install linux as an actual operating system then what?
err, what do you think?
why would it use the left over if windows *isn't running*?
RE: Ram Queery by Th3rmal on 02-05-2008 at 11:53 AM
quote:
Originally posted by NanaFreak
how can you run XP and linux at the same time? to do this, you need to use 2 different computers. thats it you cant do it in the single machine
Virtual Machines let you run 2 operating systems at the same time.
quote:ok if i got a 64bit operating system, what is the max amount of ram for that?
Originally posted by ShawnZ
why would it use the left over if windows *isn't running*?
Can i put a virtual machine on my portable hard drive or will that not work because of the ram issue?
RE: Ram Queery by ShawnZ on 02-05-2008 at 12:53 PM
quote:
Originally posted by rm rulz
ok if i got a 64bit operating system, what is the max amount of ram for that?
16 exabytes.
quote:
Originally posted by rm rulz
Can i put a virtual machine on my portable hard drive or will that not work because of the ram issue?
what ram issue?
RE: Ram Queery by Verte on 02-05-2008 at 03:42 PM
quote:
Originally posted by rm rulz
Ok if my new computer has got 4gb of ram (2x2g) in dual channel mode, (keep in mind i have 32bit main OS) since my OS only reads 3.23 gb of my ram can i use the rest of that memory for linux?
Do you have a 64 bit CPU? If you do, you might be able to use all 4 GB. The reason you can't with a 32 bit CPU is that those 32 bits can only address 4 GB of total ram- and some of the ram that needs to be addressed is video ram. Many hardware devices have a little ram (or pretend to), and if it is 'mapped' by the operating system, which allows for fast data transfer, and userspace drivers, that eats away at the 4 GB total. so the 3.23 GB is what is left after mapped I/O regions are taken out of the 32-bit address space.
a 64 bit CPU has a much larger address space, but to take advantage of this, the CPU needs to be in 64 bit mode. Running a 64 bit operating system will give you access to all of your ram. However, running a 64 bit operating system *in a VM* will not. You could do it the other way, and run MS Windows in a VM. If you've got a CPU with virtualisation instructions, you can do this with Xen. Just make sure your copy of Xen is compiled for your architecture.
ShawnZ: actually, x86-64 only supports address spaces up to 512 Terabytes, as only 48 bits are relevant, but they have room to fix that.
RE: Ram Queery by Menthix on 02-05-2008 at 05:27 PM
quote:Won't make any difference. Your 32bit Windows XP just can't handle more RAM, no matter what you do with it, it won't get past that limit. Either install a 64bit OS (if you have a 64bits CPU), or take the unused RAM out and put it in another machine.
Originally posted by rm rulz
Can i put a virtual machine on my portable hard drive or will that not work because of the ram issue?
RE: Ram Queery by Ezra on 02-05-2008 at 05:59 PM
Some operating systems use PAE to enable 64Gbit RAM access on 32-bit systems, for compatibility reasons however this is disabled on normal windows versions. It works on servers versions and linux from kernel version 2.6
RE: Ram Queery by Th3rmal on 02-05-2008 at 08:38 PM
quote:i was actually thinking of just putting the VM on my portable hard drive (so i can take it anywhere), but i was wondering since i devote a part of my ram to the VM what happens (to the ram) when i run the vm on another computer or what happens (to the ram devoted to linux) when i stop running the vm and disconnect the drive.
Originally posted by MenthiX
quote:Won't make any difference. Your 32bit Windows XP just can't handle more RAM, no matter what you do with it, it won't get past that limit. Either install a 64bit OS (if you have a 64bits CPU), or take the unused RAM out and put it in another machine.
Originally posted by rm rulz
Can i put a virtual machine on my portable hard drive or will that not work because of the ram issue?
Also if i delete all files of the VM, will this delete the whole vm or are there other little files like in registry or something. because if i devoted 512mb ram to linux and thought it wasnt working im guessing i can just delete linux to get everything including the ram and hd space back
RE: Ram Queery by NanaFreak on 02-05-2008 at 08:43 PM
even with a virtual machine, it uses the same ram as what XP will be using!!!!!!!!
the only way you can have ram dedicated to linux, is to install it on a different computer, not a portable HDD, it has to have its own ram, own cpu, ect.
and having a VM doesnt mean you are "running" 2 OS, you have one OS running another OS virtually 
RE: Ram Queery by Jesus on 02-05-2008 at 09:07 PM
quote:It doesn't have to be another computer, you can always dual-boot.
Originally posted by NanaFreak
the only way you can have ram dedicated to linux, is to install it on a different computer, not a portable HDD
Also, you could install linux on the portable HDD, make it bootable, and boot from the portable HDD whenever you want to run linux on any computer (including a virtual machine).
Note that the linux distribution on the portable HDD will have to support the target PC's CPU architecture and hardware, eg. a x86-64 linux distribution will not run on a regular 32bit CPU.
Both methods I mentioned here (dual-boot and install to portable HDD) do not necessarily require a virtual machine, however you could use a virtual machine to install the linux distro to the portable HDD by pointing it (the virtual machine) to use a physical HDD instead of a virtual HDD file.
Both methods will also use all of the available RAM (if configured correctly with PAE as Ezra mentioned), except when the portable HDD is booted inside a virtual machine under a windows installation which does not use all of the available RAM.
RE: Ram Queery by Th3rmal on 02-06-2008 at 02:52 AM
hmmm ok.
Is there anyway to make PAE work on xp or vista (not server edition).