Author Topic: [SOLVED] Memory matters  (Read 1100 times)

Offline JerryP

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[SOLVED] Memory matters
« on: October 21, 2010, 12:36:00 PM »
OK, so I don't keep up with all the "latest" hardware things happening (or even those that have happened). My old PC3200 memory has been causing me problems and I thought I'd buy more.  Sticker shock is a good way to describe what happened when I tried to do this.
Soooooo, I decided now is a good time to buy a new mobo and CPU and maybe about 8 gigs of RAM.  Now, with all the other questions I'm wrestling with (ie: what kind of board, what kind of processor, etc.) I wonder how much memory PCLOS can handle.  I understand that 32 bit Windows has limitations but is that because it's 32 bit or because it's Windows?  Can I just load up PCLOS with 8 or 16 gigs of ram?
« Last Edit: October 21, 2010, 04:35:08 PM by JerryP »
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Offline DeBaas

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Re: Memory matters
« Reply #1 on: October 21, 2010, 12:49:05 PM »
After install from CD or USB you have to install the pae kernel, that's supporting to 64G

i686 server Linux kernel (pae enabled)
This kernel package contains a PAE enabled Linux 2.6.33.7-pclos5.pae kernel, suitable for servers.
It is optimised for i686 CPUs, supports up to 64GB of high memory. The kernel timer interrupt
is set to 100 HZ, defaults to using the 'CFQ' scheduler, 'SMP' is enabled and kernel
preemption is disabled.
** Please Note: This kernel requires a CPU with Physical Address Extensions (PAE).

Offline Was_Just19

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Re: Memory matters
« Reply #2 on: October 21, 2010, 12:50:11 PM »
OK, so I don't keep up with all the "latest" hardware things happening (or even those that have happened). My old PC3200 memory has been causing me problems and I thought I'd buy more.  Sticker shock is a good way to describe what happened when I tried to do this.
Soooooo, I decided now is a good time to buy a new mobo and CPU and maybe about 8 gigs of RAM.  Now, with all the other questions I'm wrestling with (ie: what kind of board, what kind of processor, etc.) I wonder how much memory PCLOS can handle.  I understand that 32 bit Windows has limitations but is that because it's 32 bit or because it's Windows?  Can I just load up PCLOS with 8 or 16 gigs of ram?

Windows is limited because MS decided not to make their pae kernel available to Desktop users. They did make it available to others .....  such as those running their server OS.
That meant those who had it could use up to 64GB memory, IIRC.

Similarly with PCLOS ....  except it is freely available.
You just need to install the pae kernel through Synaptic to get the benefit of your 8GB or 16GB ram or most of it anyway. Their is a bigger overhead I believe when using the pae kernel, but nothing to be concerned about.

I would advise that you search for combination deals, if you intend to keep your present case.
That way the motherboard, CPU and memory are guanteed to be happy with each other.
Also they can work out cheaper.

There is at least one company which supports PCLOS which could maybe help ......  their advert should be on the front page I think.

regards.

Offline JerryP

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Re: Memory matters
« Reply #3 on: October 21, 2010, 04:22:32 PM »
...and if I don't upgrade the kernel the max RAM I can use if 4GB?
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Offline Was_Just19

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Re: Memory matters
« Reply #4 on: October 21, 2010, 04:25:01 PM »
...and if I don't upgrade the kernel the max RAM I can use if 4GB?

You can have as much as you like installed but only approximately 3.6GB of it will be addressable I think.
It is generally referred to as a 4GB limit.

Of course the kernel is easily upgraded, just like any other software package, using Synaptic.

regards

Offline JerryP

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Re: Memory matters
« Reply #5 on: October 21, 2010, 04:34:42 PM »
Thanks and "solved".
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Offline DeBaas

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Re: [SOLVED] Memory matters
« Reply #6 on: October 22, 2010, 05:39:29 AM »
Just as an addon, normally there is 4 G to address. The mem of your vid + system.
So if you have video mem from 1G the mem used for system is max 3G, even if there is 4G installed on your system.
Vid mem 512M does 3 1/2G for your system OS.
64 bit and pae OS's bypasses this limit.
Winders has only a 32bit pae for servers, so pushes you to use a 64bit version on your desktop.

Offline JerryP

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Re: [SOLVED] Memory matters
« Reply #7 on: October 22, 2010, 05:55:15 AM »
So Linux doesn't require a 64 bit OS version with the pae kernel? (meaning I can just update the kernel and it won't affect my desktop settings?)
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Offline Was_Just19

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Re: [SOLVED] Memory matters
« Reply #8 on: October 22, 2010, 06:00:46 AM »
So Linux doesn't require a 64 bit OS version with the pae kernel? (meaning I can just update the kernel and it won't affect my desktop settings?)

Correct

Offline JerryP

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Re: [SOLVED] Memory matters
« Reply #9 on: October 23, 2010, 06:12:37 AM »
OK, I installed the pae kernel. I've ordered 4 gig of RAM and my video card is 1 gig so I want to use it all.

Now my menu version choices are;

linux (/boot/vmlinuz)
linux-nonfb (/boot/vmlinuz)
failsafe (/boot/vmlinuz)
2.6.32.11-pclos2.bfs (/boot/vmlinuz-2.6.32.11-pclos2.bfs)
2.6.33.7-pclos6.pae (/boot/vmlinuz-2.6.33.7-pclos6.pae)

Should/could I use anything other than the last and still take advantage of 4+ gigs of ram? (I set the last as default).
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Offline DeBaas

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Re: [SOLVED] Memory matters
« Reply #10 on: October 23, 2010, 06:49:36 AM »
The last one is the only one supporting more than 4G, in the unlikely case of crashing/borking your system you can choose one of the others.
You can remove 2.6.32.11-pclos2.bfs with Synaptic.

Offline Was_Just19

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Re: [SOLVED] Memory matters
« Reply #11 on: October 23, 2010, 07:06:14 AM »
OK, I installed the pae kernel. I've ordered 4 gig of RAM and my video card is 1 gig so I want to use it all.

Now my menu version choices are;

linux (/boot/vmlinuz)
linux-nonfb (/boot/vmlinuz)
failsafe (/boot/vmlinuz)
2.6.32.11-pclos2.bfs (/boot/vmlinuz-2.6.32.11-pclos2.bfs)
2.6.33.7-pclos6.pae (/boot/vmlinuz-2.6.33.7-pclos6.pae)

Should/could I use anything other than the last and still take advantage of 4+ gigs of ram? (I set the last as default).


Either the first entry or the last will boot you into the pae kernel.
The first entry always links to the last installed kernel .......  provided the entry is not edited by you.

Do a test .......  boot into each and while there open a terminal and enter

uname -r   <Enter>

You should get a result showing the pae kernel in both cases.

regards.

Offline JerryP

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Re: [SOLVED] Memory matters
« Reply #12 on: October 23, 2010, 09:34:28 AM »
I did the test and you are 100% correct. Thanks. That's good to know.

I'm looking forward to 4 Gig of RAM plus 1 Gig of video.  Should be pretty smooth.
I'm getting;
2 x MEM 2G|A-DATA AX3U1600GB2G9-CG R
1 x CPU AMD|ATH II X4 640 3.0G AM3 RT
1 x MB ASUS M4A78T-E AM3 790GX/SB750 RT

Seemed like a deal for $275.00



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Offline Was_Just19

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Re: [SOLVED] Memory matters
« Reply #13 on: October 23, 2010, 10:41:54 AM »
Nice!  at least half the price I would pay here  :(

Have fun with it   ;)