| View previous topic :: View next topic |
| Author |
Message |
ianw1974
Guru
Joined: 18 Oct 2006
Posts: 387
Location: UK and Poland
|
 Posted: Tue Oct 23, 2007 11:44 am Post subject: 4GB ram installed, but Gentoo only sees 3GB [solved] |
 |
|
I'm trying to figure out why my system only sees 3GB of ram, when it has 4GB installed. If I boot Windows XP Professional x64, it sees the full 4GB of ram. My laptop supports this amount of memory, but for some reason, Gentoo always sees only 4GB.
The kernel has been configured with the 4GB option, so should be correct?
Any ideas what to check?
Last edited by ianw1974 on Tue Oct 23, 2007 4:16 pm; edited 1 time in total |
|
| Back to top |
|
 |
gerard27
Advocate
Joined: 04 Jan 2004
Posts: 2377
Location: Netherlands
|
| Posted: Tue Oct 23, 2007 11:55 am Post subject: |
|
|
Hi ianw,
I suppose you are on x86 and not x86_64.
Change your kernel .config to 64GB.
I had the same problem and this solved it.
Gerard.
_________________
To install Gentoo I use sysrescuecd.Based on Gentoo,has firefox to browse Gentoo docs and mc to browse (and edit) files.
The same disk can be used for 32 and 64 bit installs.
You can follow the Handbook verbatim.
http://www.sysresccd.org/Download |
|
| Back to top |
|
|
ianw1974
Guru
Joined: 18 Oct 2006
Posts: 387
Location: UK and Poland
|
| Posted: Tue Oct 23, 2007 11:57 am Post subject: |
|
|
Hi Gerard,
Thank's for the reply. Yes it is x86 version and not 64 bit. I've just recompiled the kernel now for 64GB, so when I reboot hopefully all will be OK. Will update in a min. |
|
| Back to top |
|
|
ianw1974
Guru
Joined: 18 Oct 2006
Posts: 387
Location: UK and Poland
|
| Posted: Tue Oct 23, 2007 4:16 pm Post subject: |
|
|
Yep, that did the trick. I now see 4GB 
Thanks very much. |
|
| Back to top |
|
|
gerard27
Advocate
Joined: 04 Jan 2004
Posts: 2377
Location: Netherlands
|
| Posted: Tue Oct 23, 2007 5:43 pm Post subject: |
|
|
You're welcome.
Gerard.
_________________
To install Gentoo I use sysrescuecd.Based on Gentoo,has firefox to browse Gentoo docs and mc to browse (and edit) files.
The same disk can be used for 32 and 64 bit installs.
You can follow the Handbook verbatim.
http://www.sysresccd.org/Download |
|
| Back to top |
|
|
MetalWarrior
Guru
Joined: 07 Nov 2004
Posts: 347
Location: Malè (Trento), Italy
|
| Posted: Sat Dec 15, 2007 8:59 pm Post subject: 4 Gb RAM.. should I see them on 32bit? [PROBLEM] |
|
|
Hi,
I've just added a 2Gb ram module to my laptop, which now has 4Gb of ram... 32-bit winzoz OSs see only 3Gb, should Gentoo (32-bit) see 4 Gb of memory?
| Code: |
# cat /proc/meminfo
MemTotal: 3103432 kB
MemFree: 2619988 kB
Buffers: 13796 kB
Cached: 154528 kB
SwapCached: 0 kB
Active: 361176 kB
Inactive: 75616 kB
HighTotal: 2227008 kB
HighFree: 1784592 kB
LowTotal: 876424 kB
LowFree: 835396 kB
SwapTotal: 2208896 kB
SwapFree: 2208896 kB
Dirty: 116 kB
Writeback: 0 kB
AnonPages: 268468 kB
Mapped: 48196 kB
Slab: 17780 kB
SReclaimable: 4920 kB
SUnreclaim: 12860 kB
PageTables: 2000 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3760612 kB
Committed_AS: 738996 kB
VmallocTotal: 114680 kB
VmallocUsed: 63512 kB
VmallocChunk: 31732 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
Hugepagesize: 4096 kB
|
Beginning of dmesg output:
| Code: |
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009b800 (usable)
BIOS-e820: 000000000009b800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000d2000 - 00000000000d4000 (reserved)
BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000bfed0000 (usable)
BIOS-e820: 00000000bfed0000 - 00000000bfee3000 (ACPI NVS)
BIOS-e820: 00000000bfee3000 - 00000000c0000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved)
BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved)
BIOS-e820: 00000000fed1c000 - 00000000fed90000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
ACPI: Shall use APIC/MADT table 2
Warning only 4GB will be used.
Use a HIGHMEM64G enabled kernel.
3200MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000f7bc0
Entering add_active_range(0, 0, 1048576) 0 entries of 256 used
Zone PFN ranges:
DMA 0 -> 4096
Normal 4096 -> 229376
HighMem 229376 -> 1048576
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
0: 0 -> 1048576
On node 0 totalpages: 1048576
DMA zone: 32 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 4064 pages, LIFO batch:0
Normal zone: 1760 pages used for memmap
Normal zone: 223520 pages, LIFO batch:31
HighMem zone: 6400 pages used for memmap
HighMem zone: 812800 pages, LIFO batch:31
Movable zone: 0 pages used for memmap
|
This other piece of dmesg output says something about 3 of 4 Gb available:
| Code: |
Memory: 3101416k/4194304k available (4432k kernel code, 41784k reserved, 1867k data, 312k init, 2227008k highmem)
virtual kernel memory layout:
fixmap : 0xffe14000 - 0xfffff000 (1964 kB)
pkmap : 0xff800000 - 0xffc00000 (4096 kB)
vmalloc : 0xf8800000 - 0xff7fe000 ( 111 MB)
lowmem : 0xc0000000 - 0xf8000000 ( 896 MB)
.init : 0xc0730000 - 0xc077e000 ( 312 kB)
.data : 0xc0554046 - 0xc0726cac (1867 kB)
.text : 0xc0100000 - 0xc0554046 (4432 kB)
|
I don't know if I've understood how is linux using the ram.. does it use 3G for userspace and <1G for the kernel?
It seems to see only 3Gb, 2.2 of which are Highmem and 0.8 lowmem..
If you need other info to help me, just ask
_________________
(Our) system as a whole is more or less the GNU system, with Linux added.
When you're talking about this combination, please call it ``GNU/Linux''. ~ Richard Stallman
http://www.gnu.org/gnu/why-gnu-linux.html |
|
| Back to top |
|
|
nixnut
Bodhisattva
Joined: 09 Apr 2004
Posts: 10974
Location: the dutch mountains
|
| Posted: Sat Dec 15, 2007 9:09 pm Post subject: |
|
|
merged above post here.
_________________
Please add [solved] to the initial post's subject line if you feel your problem is resolved. Help answer the unanswered
talk is cheap. supply exceeds demand |
|
| Back to top |
|
|
MetalWarrior
Guru
Joined: 07 Nov 2004
Posts: 347
Location: Malè (Trento), Italy
|
| Posted: Sat Dec 15, 2007 9:41 pm Post subject: |
|
|
| nixnut wrote: | | merged above post here. |
Thanks for the merge... I'm sorry for the duplicated thread..
BTW, thanks for the solution!
_________________
(Our) system as a whole is more or less the GNU system, with Linux added.
When you're talking about this combination, please call it ``GNU/Linux''. ~ Richard Stallman
http://www.gnu.org/gnu/why-gnu-linux.html |
|
| Back to top |
|
|
cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
|
| Posted: Sat Dec 15, 2007 10:28 pm Post subject: |
|
|
There is a performance hit when you have HIGHMEM64G=y due to the paging tricks involved.
Normally you would want to run a 64bit OS when you have this much RAM installed. |
|
| Back to top |
|
|
MetalWarrior
Guru
Joined: 07 Nov 2004
Posts: 347
Location: Malè (Trento), Italy
|
| Posted: Sun Dec 16, 2007 12:21 am Post subject: |
|
|
| cyrillic wrote: | There is a performance hit when you have HIGHMEM64G=y due to the paging tricks involved.
Normally you would want to run a 64bit OS when you have this much RAM installed. |
You're right, but now it's too late for me.. unless there is a way to "upgrade" my current install to 64-bit recompiling everything (because a fresh install would mean re-customize everything again, which is too much time-consuming..)
_________________
(Our) system as a whole is more or less the GNU system, with Linux added.
When you're talking about this combination, please call it ``GNU/Linux''. ~ Richard Stallman
http://www.gnu.org/gnu/why-gnu-linux.html |
|
| Back to top |
|
|
ianw1974
Guru
Joined: 18 Oct 2006
Posts: 387
Location: UK and Poland
|
| Posted: Sun Dec 16, 2007 7:21 pm Post subject: |
|
|
| cyrillic wrote: | There is a performance hit when you have HIGHMEM64G=y due to the paging tricks involved.
Normally you would want to run a 64bit OS when you have this much RAM installed. |
Providing of course that your system supports 64 bit, otherwise you'd only be able to use a 32 bit version for the 4GB installed 
_________________
Ian Walker
Light travels faster than sound. This is why some people appear bright until you hear them speak.........
Linux Systems Limited | Masternode Monitoring |
|
| Back to top |
|
|
cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
|
| Posted: Sun Dec 16, 2007 7:49 pm Post subject: |
|
|
I think most people in this situation already have a 64bit capable CPU.
... they just make lame excuses about why they are still using a 32bit OS |
|
| Back to top |
|
|
ianw1974
Guru
Joined: 18 Oct 2006
Posts: 387
Location: UK and Poland
|
| Posted: Mon Dec 17, 2007 8:04 am Post subject: |
|
|
This is true
I had 32 bit for a while on my laptop although originally it had only 1GB of RAM before I upgraded to 4GB. I wasn't sure about 64 bit at first, but now I've moved to it and find it's working well. Not had any problems yet, other than skype not connecting but the rest of the stuff works fine.
Although, I do have some servers with 4GB of ram that unfortunately won't run a 64 bit OS because of the processor not being 64 bit compatible.
_________________
Ian Walker
Light travels faster than sound. This is why some people appear bright until you hear them speak.........
Linux Systems Limited | Masternode Monitoring |
|
| Back to top |
|
|
MetalWarrior
Guru
Joined: 07 Nov 2004
Posts: 347
Location: Malè (Trento), Italy
|
| Posted: Thu Dec 20, 2007 10:52 pm Post subject: |
|
|
| cyrillic wrote: | I think most people in this situation already have a 64bit capable CPU.
... they just make lame excuses about why they are still using a 32bit OS |
I've just finished installing my X86_64 Gentoo It took only few hours to have a 64-bit fresh Gentoo, with my previous configuration 
_________________
(Our) system as a whole is more or less the GNU system, with Linux added.
When you're talking about this combination, please call it ``GNU/Linux''. ~ Richard Stallman
http://www.gnu.org/gnu/why-gnu-linux.html |
|
| Back to top |
|
|
feliks
n00b
Joined: 03 Oct 2003
Posts: 6
Location: Warsaw, Poland
|
| Posted: Sun Dec 30, 2007 9:00 pm Post subject: Not solved yet for me... |
|
|
| Gerard van Vuuren wrote: | Hi ianw,
I suppose you are on x86 and not x86_64.
Change your kernel .config to 64GB.
I had the same problem and this solved it.
Gerard. |
Hi, this didn't help me a bit. I have x86, I configured my kernel with the 64GB option and:
| Code: | $ free
total used free shared buffers cached
Mem: 3505396 2463688 1041708 0 628 2141668
-/+ buffers/cache: 321392 3184004
Swap: 1574360 0 1574360 |
And:
| Code: | $ cat /proc/meminfo
MemTotal: 3505396 kB
MemFree: 920440 kB
Buffers: 660 kB
Cached: 2261708 kB
SwapCached: 0 kB
Active: 332156 kB
Inactive: 2186892 kB
HighTotal: 2621248 kB
HighFree: 118916 kB
LowTotal: 884148 kB
LowFree: 801524 kB
SwapTotal: 1574360 kB
SwapFree: 1574360 kB
Dirty: 44136 kB
Writeback: 68 kB
AnonPages: 256628 kB
Mapped: 45064 kB
Slab: 27208 kB
SReclaimable: 13068 kB
SUnreclaim: 14140 kB
PageTables: 2572 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3327056 kB
Committed_AS: 1003868 kB
VmallocTotal: 118776 kB
VmallocUsed: 17704 kB
VmallocChunk: 100924 kB |
These values don't seem to have changed a byte from the 4GB kernel config option... Any ideas? |
|
| Back to top |
|
|
ShinyThings
Tux's lil' helper
Joined: 03 Jul 2007
Posts: 89
Location: Ontario
|
| Posted: Sun Dec 30, 2007 9:11 pm Post subject: Re: Not solved yet for me... |
|
|
| feliks wrote: | | Gerard van Vuuren wrote: | Hi ianw,
I suppose you are on x86 and not x86_64.
Change your kernel .config to 64GB.
I had the same problem and this solved it.
Gerard. |
Hi, this didn't help me a bit. I have x86, I configured my kernel with the 64GB option and:
| Code: | $ free
total used free shared buffers cached
Mem: 3505396 2463688 1041708 0 628 2141668
-/+ buffers/cache: 321392 3184004
Swap: 1574360 0 1574360 |
And:
| Code: | $ cat /proc/meminfo
MemTotal: 3505396 kB
MemFree: 920440 kB
Buffers: 660 kB
Cached: 2261708 kB
SwapCached: 0 kB
Active: 332156 kB
Inactive: 2186892 kB
HighTotal: 2621248 kB
HighFree: 118916 kB
LowTotal: 884148 kB
LowFree: 801524 kB
SwapTotal: 1574360 kB
SwapFree: 1574360 kB
Dirty: 44136 kB
Writeback: 68 kB
AnonPages: 256628 kB
Mapped: 45064 kB
Slab: 27208 kB
SReclaimable: 13068 kB
SUnreclaim: 14140 kB
PageTables: 2572 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3327056 kB
Committed_AS: 1003868 kB
VmallocTotal: 118776 kB
VmallocUsed: 17704 kB
VmallocChunk: 100924 kB |
These values don't seem to have changed a byte from the 4GB kernel config option... Any ideas? |
I have the same problem. It is caused by the fact that some resources other than RAM have to be mapped in those 4GB. PCI-express, other devices, etc. In your BIOS, there may be an option for memory remapping. If there is, enable it. If not (like is the case for my chipset) you may be out of luck. |
|
| Back to top |
|
|
PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
|
| Posted: Sun Dec 30, 2007 9:23 pm Post subject: |
|
|
See thread.
Dammit people, there's a Search button - use it. |
|
| Back to top |
|
|
feliks
n00b
Joined: 03 Oct 2003
Posts: 6
Location: Warsaw, Poland
|
| Posted: Mon Dec 31, 2007 12:48 am Post subject: |
|
|
| PaulBredbury wrote: | See thread.
Dammit people, there's a Search button - use it. |
Dammit, if you had actually *read* my posting, you'd know that I have the correct kernel config options *set*, and that this didn't help. Apart from that, the search functionality on this forum engine is next to useless, but this is off-topic. Here's the relevant bit from my kernel configuration.
| Code: | $ zcat /proc/config.gz | grep HIGHMEM
# CONFIG_NOHIGHMEM is not set
# CONFIG_HIGHMEM4G is not set
CONFIG_HIGHMEM64G=y
CONFIG_HIGHMEM=y
CONFIG_DEBUG_HIGHMEM=y |
| Quote: | | It is caused by the fact that some resources other than RAM have to be mapped in those 4GB. PCI-express, other devices, etc. In your BIOS, there may be an option for memory remapping. If there is, enable it. If not (like is the case for my chipset) you may be out of luck. |
As to this suggestion, I can't understand why it would reserve such a big amount of memory for those things, when it obviously did *not* when I had 1GB. Unfortunately, this is a laptop with very limited tweaking options in the BIOS. So if it reserves an amount of memory proportional to the total amount, than I'm truly out of luck. |
|
| Back to top |
|
|
blu3bird
Retired Dev
Joined: 04 Oct 2003
Posts: 614
Location: Munich, Germany
|
| Posted: Mon Dec 31, 2007 1:12 am Post subject: |
|
|
Does your command line contain any "mem=" option?
You can try to force the kernel to detect all your memory by setting "mem=4G". This would help if you bios is bugged.
(grep -i mem /proc/cmdline)
Does your mainboard support 4GB of memory? Eg does the BIOS display 4194304KB when it boots?
Does your CPU support PAE?
I'm not sure if > 3GB of memory work on x86 without pae...
(grep -i pae /proc/cpuinfo)
_________________
Black Holes are created when God divides by zero! |
|
| Back to top |
|
|
Monkeh
Veteran
Joined: 06 Aug 2005
Posts: 1656
Location: England
|
| Posted: Mon Dec 31, 2007 2:15 am Post subject: |
|
|
| feliks: Is your CPU a Pentium-M? |
|
| Back to top |
|
|
feliks
n00b
Joined: 03 Oct 2003
Posts: 6
Location: Warsaw, Poland
|
| Posted: Mon Dec 31, 2007 8:20 am Post subject: |
|
|
| blu3bird wrote: | Does your command line contain any "mem=" option?
You can try to force the kernel to detect all your memory by setting "mem=4G". This would help if you bios is bugged.
(grep -i mem /proc/cmdline)
Does your mainboard support 4GB of memory? Eg does the BIOS display 4194304KB when it boots?
Does your CPU support PAE?
I'm not sure if > 3GB of memory work on x86 without pae...
(grep -i pae /proc/cpuinfo) |
Yeah, the processor of course supports PAE, it's a Core Duo T2400 (and as shown above, PAE is also enabled in the kernel). The BIOS says 4096M, when I check “memory installed” in the BIOS. Otherwise, there's no mention of the amount of memory installed. http://h18002.www1.hp.com/products/quickspecs/12427_na/12427_na.HTML#Memory ← this page shows this laptop supports 4GB, even though there's the “Above 3-GB, all memory may not be available due to system resource requirements.” warning, whatever that means (especially the “may”. May? Maybe? Maybe not?).
I tried running the kernel with the mem option but it just won't load (neither with 4G nor slightly lesser values).
Best,
Last edited by feliks on Mon Dec 31, 2007 8:22 am; edited 2 times in total |
|
| Back to top |
|
|
feliks
n00b
Joined: 03 Oct 2003
Posts: 6
Location: Warsaw, Poland
|
| Posted: Mon Dec 31, 2007 8:21 am Post subject: |
|
|
| Monkeh wrote: | | feliks: Is your CPU a Pentium-M? |
It's a Core Duo T2400. |
|
| Back to top |
|
|
Monkeh
Veteran
Joined: 06 Aug 2005
Posts: 1656
Location: England
|
| Posted: Mon Dec 31, 2007 4:37 pm Post subject: |
|
|
| Sounds like the BIOS is terminally braindead. |
|
| Back to top |
|
|
feliks
n00b
Joined: 03 Oct 2003
Posts: 6
Location: Warsaw, Poland
|
| Posted: Tue Jan 01, 2008 3:12 pm Post subject: |
|
|
| Monkeh wrote: | | Sounds like the BIOS is terminally braindead. |
Probably. Unfortunately this is the latest version and otherwise the best. |
|
| Back to top |
|
|
Zucca
Moderator
Joined: 14 Jun 2007
Posts: 3939
Location: Rasi, Finland
|
| Posted: Wed Mar 04, 2009 8:57 pm Post subject: |
|
|
| cyrillic wrote: | I think most people in this situation already have a 64bit capable CPU.
... they just make lame excuses about why they are still using a 32bit OS :wink: |
\o I have 32-bit Core Duo. And enabling 64Gb support does not help. I still see ~3Gb.
EDIT: My CPU has the PAE flag.
EDIT2: Here's a part of my dmesg: | Code: | | [ 12.711703] Memory: 3101648k/3144256k available (5520k kernel code, 41476k reserved, 1822k data, 312k init, 2226752k highmem) |
That's strange.
_________________
..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
|
|
| Back to top |
|
|
|
Kernel & Hardware
