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Old 01-11-2007, 10:10 AM   #1
drewb1977
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Can't see 4 Gb RAM with ASUS P5B Deluxe / x86_64 Fedora Core 6


Does anyone have any experience recognizing 4 Gb of memory on
an ASUS P5B Deluxe motherboard while running Fedora Core 6 ?

I've recently put together a workstation with the following
components:

ASUS P5B Deluxe (bios v.0614)
Intel Core 2 Duo E6600
2 kits of 2x1Gb OCZ2P8002GK (4 Gb of RAM total)
NVIDIA Gforce 7300GS video card
3 x WD4000YR SATA HDs

I've installed the 64 bit version of Fedora Core 6, running
kernel version 2.6.18-2798.

Default settings in the bios only recognize 3008 Mb of RAM, and
Linux will boot and recognize this amount of memory.

Enabling the "Memory Remap" feature in the BIOS allows
the BIOS system monitor to recognize 4096 Mb of Ram. However,
the system will not boot.

Is there a compatibility problem with the motherboard / memory / kernel configuration?

Thanks for any suggestions.
 
Old 01-11-2007, 10:55 AM   #2
macemoneta
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My understanding is that enabling memory remap will provide access to 4GB of RAM but disable the onboard Ethernet adapter when you are using a x86_64 or PAE enabled kernel. ASUS has just gotten the function working with Windows, but Linux compatibility is still pending.
 
Old 11-12-2007, 07:21 AM   #3
Jo Pinto
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Thumbs up Same on fedora 8 with Asus P5B : 4 GB RAM not seen

I bought a PC with 4 GB RAM and install fedora 8 with kernel 2.6.23.1-42.fc8. The motherboard is an Asus P5B.

1) when I type free (or cat /proc/meminfo), the total memory reported was 3 GB (1 missing). The BIOS was also reporting 3 GB.

2) I went back to the store (dohhh...) thinking that they screw me up... The guy did change the BIOS "Memory Remap feature" to enabled in the Advanced chipset feature. Note that this is not even documented in the P5B user guide.... OK, now the BIOS reported 4 GB. Cool.

3) I went back home, loaded the system and typed free (or cat /proc/meminfo) and now the system was reporting 2 GB (2 missing)..... Arghhh !!!

4) After some googling around, I installed the PAE kernel. My grub.conf look like :


title Fedora (2.6.23.1-49.fc8PAE)
root (hd0,0)
kernel /vmlinuz-2.6.23.1-49.fc8PAE ro root=LABEL=/1 rhgb quiet
initrd /initrd-2.6.23.1-49.fc8PAE.img


and now, free reports :


total used free shared buffers cached
Mem: 4139220 715704 3423516 0 19516 342284
-/+ buffers/cache: 353904 3785316
Swap: 5116660 0 5116660


and cat /proc/meminfo :


Memory
========================

MemTotal: 4139220 kB
MemFree: 3423548 kB
Buffers: 19612 kB
[...]


Problem solved.

Hope this help.

M.


PS : both ethernet interfaces (eth0 on the mainboard, eth1 on a PCI NIC) are still working.
 
Old 11-16-2007, 04:32 AM   #4
tbl
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Nice ! It works very well. thx !
 
Old 11-16-2007, 05:25 PM   #5
jay73
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If you are going to use 4GB of RAM, there is really little interest in sticking with a 32 bit system. 64 bit Fedora will recognize all of that RAM out of the box + you won't suffer the performance penalty that comes with using PAE nor the potential hardware issues (some drivers simply don't like PAE all that much).

@drewb

I have been running 64 bit Fedora with one of those boards and 4GB for over a year now. It used to be pretty problematic because of 32 bit only plugins (macromedia, java, flash, ...) but that is all in the past now. It works just as well as 32 bit.

Last edited by jay73; 11-16-2007 at 05:29 PM.
 
Old 11-17-2007, 01:38 AM   #6
tbl
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Thank you jay
I didn't even mind it !
I will give it a try asap.
 
Old 12-03-2007, 02:17 PM   #7
Jo Pinto
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Quote:
Originally Posted by tbl View Post
I will give it a try asap.
Any news ? I don't have the time (and the guts...) to try it myself.

Your expericence, if any, if more than welcome
 
Old 12-03-2007, 02:54 PM   #8
tbl
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Quote:
Originally Posted by Jo Pinto View Post
Any news ? I don't have the time (and the guts...) to try it myself.

Your expericence, if any, if more than welcome
Well, since it works with PAE, and since I know trhere are no flash 64 bits plugins, I prefer to keep PAE : works nice for me.
 
Old 12-03-2007, 02:59 PM   #9
jay73
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Well, as I said, I have one of those motherboards and 4GB of RAM. Works perfectly with a 64 bit OS - with Fedora, Mandriva and Solaris, at least. You will run into a little issue with the 64 bit versions of Debian/Ubuntu, though, unless you specify mem=6144MB agp=off as additional boot arguments. If you don't, they simply won't boot.

Anyway, if you're wondering why you see only 2GB, I'll explain: 32 bit systems (without PAE) can access only 4GB of memory. Since part of that memory needs to be reserved for I/O, only part of it remains for RAM (about 3GB). One solution is called memory mapping but since it pushes any RAM above 2GB over the 4GB limit, 32 bit users won't see the benefit: rather than getting more, they will get less (only the first 2 GB that fall within the 4GB area). 64 bit, however, can see way beyond 4GB so it doesn't suffer from such quirks.

No 64 bit flash plugins? Sure but then we've been using nspluginwrapper for over a year now, it works just as well.

Last edited by jay73; 12-03-2007 at 03:01 PM.
 
Old 01-27-2008, 02:05 AM   #10
tbl
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Quote:
Originally Posted by jay73 View Post
No 64 bit flash plugins? Sure but then we've been using nspluginwrapper for over a year now, it works just as well.
jay73, could tell a bit more about this, please ?

Using PAE version makes strange things when running wine ! It just logs me out
If I try x64 (i use fc8), how may i use 32 bit plugins for www ?

thx
 
Old 01-27-2008, 04:09 AM   #11
jay73
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Which distribution do you use? Most now have nspluginwrapper in their repositories, a utility that allows people to run 32 bit browser plug-ins even though they have a 64 bit browser. It works with flash, with adobe reader, with realplayer, ... Only the java plug-in is still a bit of a problem but I believe that the icedtea java plug-in works better. You should really give it a try.
 
Old 01-27-2008, 04:41 AM   #12
tbl
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I use fedora 8

thx

BTW : is it wellknown that PAe makes log off like i mentioned above ??? :-/
 
Old 01-27-2008, 06:34 AM   #13
jay73
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The problem with PAE is that it not only has a predictable effect (more overhead and thus a slower system) but a few unpredictable ones. It increases memory space from 32 bit to 36 and not all applications like that kind of tweak very much. Some become unstable, other ones will fail completely. I feel that PAE fully makes sense only systems where you have maximum control over compilation and configuration. Or on a production server that can't be taken down to replace the OS with its 64 bit version. But then servers tend to have fewer applications so the risk of PAE creating issues is usually far smaller than it would be on a home user's computer.

I am not familiar with the WINE thing you referred to. Still, if it's closely modeled on windows xp, I wouldn't be surprised. Microsoft all but ripped out PAE support with SP2 because they were getting too many angry calls from users who were trying to do that on cheaper systems that became completely unstable.

Now, since you are using fedora 8, it should be so easy because nspluginwrapper has been integrated into the repositories. Just do a yum install nspluginwrapper. If you're lucky, things should work out of the box. If not, you can get them to work using the mozilla-plugin-config command. Traditionally, one had to use the nspluginwrapper command but the folks at fedora for some reason decided to rename it; it works pretty much the same, though.

Last edited by jay73; 01-27-2008 at 06:41 AM.
 
Old 01-27-2008, 07:57 AM   #14
tbl
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Ok thx
I think I will try a fresh install ; using the current configuration file, it should be quite easy to set all on.

thank you for your replies.
 
Old 01-28-2008, 11:20 PM   #15
tbl
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jay73,
thank you : it works *very* well, and much faster !
fedora plays very well with 32 bit plugin.
Really cool !
 
  


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