LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 01-15-2009, 09:47 AM   #1
ghendric
LQ Newbie
 
Registered: Jan 2009
Posts: 3

Rep: Reputation: 0
Fedora 10 memory usage


Can Fedora 10 64 bit recognize more than 3 gigs of RAM?

Thanks
 
Old 01-15-2009, 09:59 AM   #2
ronlau9
Senior Member
 
Registered: Dec 2007
Location: In front of my LINUX OR MAC BOX
Distribution: Mandriva 2009 X86_64 suse 11.3 X86_64 Centos X86_64 Debian X86_64 Linux MInt 86_64 OS X
Posts: 2,369

Rep: Reputation: Disabled
Quote:
Originally Posted by ghendric View Post
Can Fedora 10 64 bit recognize more than 3 gigs of RAM?

Thanks
Mine is 4 GB fully recognized by Fedora 10 X86_64
 
Old 01-15-2009, 10:13 AM   #3
rjswilson
LQ Newbie
 
Registered: Mar 2006
Posts: 7

Rep: Reputation: 0
Yes it can. have 8GB of RAM on my server and it recognizes it
 
Old 01-15-2009, 10:34 AM   #4
Cottsay
Member
 
Registered: Feb 2004
Location: Chaska, MN
Distribution: Fedora
Posts: 195

Rep: Reputation: 31
I wouldn't worry about reaching Fedora memory limit. Something tells me its up by 32 gigs or something absurd like that...

--scott
 
Old 01-15-2009, 12:25 PM   #5
johnsfine
LQ Guru
 
Registered: Dec 2007
Distribution: Centos
Posts: 5,286

Rep: Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190
Quote:
Originally Posted by ghendric View Post
Can Fedora 10 64 bit recognize more than 3 gigs of RAM?
Any distribution of 64-bit Linux can recognize over 4GB and many distributions of 32-bit Linux can recognize over 4GB.

But for support beyond about 3.25GB of RAM any of those require that the motherboard chipset supports address space beyond 4GB and that the BIOS properly initialize that chipset support.

If you have a problem with ram beyond about 3.25GB, then maybe you have a problem with the BIOS or chipset. Most releases of 32 bit Windows and some builds of 32-bit Linux hit that limit even if BIOS and chipset support more; But many builds of 32-bit Linux work beyond that limit, so a problem with one of those means the limit is in the BIOS or chipset.

If your BIOS or chipset (or OS) is limited to 4GB, that does not mean it supports a nearly full 4GB. If it doesn't support more than 4GB, it actually doesn't support more than about 3.25 GB (the exact limit depends on the BIOS and might be almost 3.7GB or barely over 3GB or anywhere in between).

Last edited by johnsfine; 01-15-2009 at 12:29 PM.
 
Old 01-15-2009, 02:30 PM   #6
farslayer
LQ Guru
 
Registered: Oct 2005
Location: Willoughby, Ohio
Distribution: linuxdebian
Posts: 7,232
Blog Entries: 5

Rep: Reputation: 190Reputation: 190
You are all thinking small..

Quote:
the real current upstream kernel hard memory limit on x86-64 is 44 bits, i.e. 16 TB.
http://linux.derkeiler.com/Mailing-L.../msg05965.html

Any lower limitation is a limitation of your hardware or BIOS.
 
Old 01-16-2009, 03:42 AM   #7
ronlau9
Senior Member
 
Registered: Dec 2007
Location: In front of my LINUX OR MAC BOX
Distribution: Mandriva 2009 X86_64 suse 11.3 X86_64 Centos X86_64 Debian X86_64 Linux MInt 86_64 OS X
Posts: 2,369

Rep: Reputation: Disabled
Quote:
Originally Posted by farslayer View Post
You are all thinking small..


http://linux.derkeiler.com/Mailing-L.../msg05965.html

Any lower limitation is a limitation of your hardware or BIOS.
Well the user manual of youŕe Mobo will tell you what the limitations is.
And sometimes it is wise to upgrade the BIOS
 
Old 01-16-2009, 02:18 PM   #8
farslayer
LQ Guru
 
Registered: Oct 2005
Location: Willoughby, Ohio
Distribution: linuxdebian
Posts: 7,232
Blog Entries: 5

Rep: Reputation: 190Reputation: 190
The question was, can the OS recognize more than 3GB.. not what is the limitation of a particular motherboard. and the answer is absolutely it can.

Although I agree the Motherboard limitation is definitely something you should check before purchasing more RAM.. One does need to take into account all factors when configuring a system.
 
Old 01-16-2009, 02:35 PM   #9
johnsfine
LQ Guru
 
Registered: Dec 2007
Distribution: Centos
Posts: 5,286

Rep: Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190
Quote:
Originally Posted by farslayer View Post
The question was, can the OS recognize more than 3GB.
Most of us try to guess what the OP should have asked and answer that. Otherwise, the second post in this thread could have been "Yes" and nothing further would be appropriate.

In this case, we (maybe mainly me) seem to have gone a bit overboard, given the lack of any follow up by the OP. But I will continue answering more than was asked, when it seems appropriate.
 
Old 01-16-2009, 11:11 PM   #10
ghendric
LQ Newbie
 
Registered: Jan 2009
Posts: 3

Original Poster
Rep: Reputation: 0
I have the AsRock 939Dual-VSTA motherboard (http://www.asrock.com/mb/overview.as...ual-VSTA&s=939) and at boot up, it says that I have 3.2 gigs of RAM even though I really have 4 gigs installed. Vista 64 bit sees all 4 gigs just fine, but Fedora 10 reports only 3.1 in System Monitor.
 
Old 01-16-2009, 11:51 PM   #11
ronlau9
Senior Member
 
Registered: Dec 2007
Location: In front of my LINUX OR MAC BOX
Distribution: Mandriva 2009 X86_64 suse 11.3 X86_64 Centos X86_64 Debian X86_64 Linux MInt 86_64 OS X
Posts: 2,369

Rep: Reputation: Disabled
Quote:
Originally Posted by ghendric View Post
I have the AsRock 939Dual-VSTA motherboard (http://www.asrock.com/mb/overview.as...ual-VSTA&s=939) and at boot up, it says that I have 3.2 gigs of RAM even though I really have 4 gigs installed. Vista 64 bit sees all 4 gigs just fine, but Fedora 10 reports only 3.1 in System Monitor.
What is output of the command free in fedora ?
 
Old 01-17-2009, 01:39 AM   #12
Hitboxx
Senior Member
 
Registered: Mar 2006
Location: India
Distribution: Fedora
Posts: 1,562
Blog Entries: 3

Rep: Reputation: 61
I also have a such type of mobo, and it does indeed say as 3.1 in my 64bit F10 and also Win XP 32bit. However this is a problem of the motherboard (DRM anyone). It is tied into for (Windows)Vista only.

Quote:
*Due to the chipset limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows® XP, Windows® XP 64-bit, Windows® Vista™ and Windows® Vista™ 64-bit.
This is from my motherboard's details http://www.asrock.com/mb/overview.as...7%20R2.0&s=775

800mb reserved for what stupid things I don't know. Also in the BIOS, I can see my 4gigs RAM as 2x2098 proper, but on booting during POST, it only shows 3200mb. So there you go.

Buying this product was a very stupid decision on my part although at the time my original Intel conked off and I was in dire need of a cheapo. I have learned my lesson and will never buy this company's products again.
 
Old 01-17-2009, 08:27 AM   #13
johnsfine
LQ Guru
 
Registered: Dec 2007
Distribution: Centos
Posts: 5,286

Rep: Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190
Quote:
Originally Posted by ghendric View Post
I have the AsRock 939Dual-VSTA motherboard (http://www.asrock.com/mb/overview.as...ual-VSTA&s=939) and at boot up, it says that I have 3.2 gigs of RAM even though I really have 4 gigs installed. Vista 64 bit sees all 4 gigs just fine, but Fedora 10 reports only 3.1 in System Monitor.
If Vista 64 can see all 4 gigs of RAM, then 64-bit Linux should also and some builds of 32-bit Linux should.

Try the command
Code:
dmesg | less
to look at log info from the startup of Linux (you may need to do it fairly soon after Linux startup to avoid having these log entries over written by later entries).

Look for a table similar to
Code:
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009e800 (usable)
 BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 00000000bbee0000 (usable)
 BIOS-e820: 00000000bbee0000 - 00000000bbee3000 (ACPI NVS)
 BIOS-e820: 00000000bbee3000 - 00000000bbef0000 (ACPI data)
 BIOS-e820: 00000000bbef0000 - 00000000bbf00000 (reserved)
 BIOS-e820: 00000000bc000000 - 00000000c0000000 (reserved)
 BIOS-e820: 00000000f0000000 - 00000000f2000000 (reserved)
 BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
 BIOS-e820: 0000000100000000 - 0000000240000000 (usable)
That tells you the info the BIOS gave to Linux about the ram. If the amount of ram is not what you expect, that table tells you whether the problem is in the info passed from the BIOS to Linux or whether it is in Linux itself.

If you find that table, but don't understand the contents, paste it into a post in this thread and someone will explain it.
 
Old 01-17-2009, 08:34 AM   #14
johnsfine
LQ Guru
 
Registered: Dec 2007
Distribution: Centos
Posts: 5,286

Rep: Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190Reputation: 1190
Quote:
Originally Posted by Hitboxx View Post
I also have a such type of mobo, and it does indeed say as 3.1 in my 64bit F10 and also Win XP 32bit. However this is a problem of the motherboard (DRM anyone). It is tied into for (Windows)Vista only.
Notice the key difference in the phrasing of the footnote about the ram limit between the mobo documentation you linked to and the documentation the OP linked to.

In your copy it says "chipset limitation" meaning the limit applies to all OS's.

In the OP's copy it says "operating system limitation" meaning it applies only to some 32-bit OS's and not to 64-bit OS's.

Last edited by johnsfine; 01-17-2009 at 08:35 AM.
 
Old 01-17-2009, 11:44 PM   #15
Hitboxx
Senior Member
 
Registered: Mar 2006
Location: India
Distribution: Fedora
Posts: 1,562
Blog Entries: 3

Rep: Reputation: 61
Yeah I saw that, was more of a let go rant
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Fedora Core 5 97% memory usage? impulse() Linux - Distributions 4 06-06-2006 04:27 AM
Fedora Core 5 Memory Usage dudeman41465 Linux - Software 1 04-10-2006 02:06 PM
Fedora Memory Usage Devyn Linux - Software 7 06-13-2005 08:37 PM
how to determine cpu usage, memory usage, I/O usage by a particular user logged on li rags2k Programming 4 08-21-2004 04:45 AM
Memory Usage in X (Fedora Core 2) Chebyshev Linux - Software 4 07-31-2004 01:11 PM


All times are GMT -5. The time now is 12:11 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration