Possible Duplicate:
Ubuntu only detects 3.1 GB of ram on Ubuntu 64 bit
ISSUE IDENTIFIED: BIOS bug. See dmesg output below.
Question is: How to resolve this? Change made since 2.6.32 have introduced this. Is there a patch Canonical or the kernel maintainers can provide to fix this? Who do I refer this to?
Thanks everyone!
ORIGINAL QUESTION:
I think there is an issue with the 64-bit 2.6.35 kernel that ships with Ubuntu 10.10. I have a Gigabtye GA-970A-UD3 with an AMD FX-8120 processor, 16GB DDR3-1333, nVidia GTX550Ti and an OCZ Agility 3 120GB SSD.
I installed Ubuntu 10.10 on it to get SSD TRIM support with the 2.6.35 kernel. However, after successful OS install, System Monitor only reports 3.2GB. It sees the 8 cores of the FX-8120 and the uname -a
reports x86_64. Furthermore, dmidecode
shows the four banks of memory being filled. Suspecting memory, I swapped out the 16GB for 8GB from a different manufacturer but still the same issue exists. 10.10 with a 2.6.35 kernel won't see more than 4GB on 64-bit.
I have a 64-bit 10.04 LTS install on an i7-960 with 24GB RAM and it sees all 24GB. When I boot the 64-bit 10.04 LTS on the FX-8120 machine, it sees all 16GB and 8 cores.
Clearly something has changed between 2.6.32 and 2.6.35 to affect the memory support.
I am after the TRIM support of 2.6.35 but not at the cost of losing 75% of my RAM. I am looking for some guidance or suggestions. Is a new kernel flag required or do I need to get a custom build of 2.6.33 onward to resolve the TRIM support and memory issue simultaneously.
Any help appreciated!
UPDATE: The version of 10.04 LTS installed is whatever ISO the Ubuntu download site provides for the 10.04 64-bit release. I have turned on "Download Updates" while installing so whatever 10.04 LTS currently does on a clean install with that ISO is what I am running. I can provide outputs for whatever commands are requested to determine the exact builds/revisions this machine is on. I am also going to test boot 10.10 on my i7-960 to see if it reports 4GB vs. 24GB. This would eliminate chipset support as a potential issue since it would cross architectural boundaries and indicate a kernel issue.
UPDATE 2: It is a BIOS bug.
dmesg output snippet:
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 2.6.35-22-generic (buildd@allspice) (gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu4) ) #33-Ubuntu SMP Sun Sep 19 20:32:27 UTC 2010 (Ubuntu 2.6.35-22.33-generic 2.6.35.4)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=9129347f-e2a2-4b97-965c-800823aaf090 ro quiet splash
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009a000 (usable)
[ 0.000000] BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
[ 0.000000] BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000cfda0000 (usable)
[ 0.000000] BIOS-e820: 00000000cfda0000 - 00000000cfdd1000 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000cfdd1000 - 00000000cfe00000 (ACPI data)
[ 0.000000] BIOS-e820: 00000000cfe00000 - 00000000cff00000 (reserved)
[ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 000000042f000000 (usable)
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] DMI 2.4 present.
[ 0.000000] e820 update range: 0000000000000000 - 0000000000001000 (usable) ==> (reserved)
[ 0.000000] e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
[ 0.000000] No AGP bridge found
[ 0.000000] last_pfn = 0x42f000 max_arch_pfn = 0x400000000
[ 0.000000] MTRR default type: uncachable
[ 0.000000] MTRR fixed ranges enabled:
[ 0.000000] 00000-9FFFF write-back
[ 0.000000] A0000-BFFFF uncachable
[ 0.000000] C0000-C7FFF write-protect
[ 0.000000] C8000-FFFFF uncachable
[ 0.000000] MTRR variable ranges enabled:
[ 0.000000] 0 base 000000000000 mask FFFF80000000 write-back
[ 0.000000] 1 base 000080000000 mask FFFFC0000000 write-back
[ 0.000000] 2 base 0000C0000000 mask FFFFF0000000 write-back
[ 0.000000] 3 base 0000CFE00000 mask FFFFFFE00000 uncachable
[ 0.000000] 4 disabled
[ 0.000000] 5 disabled
[ 0.000000] 6 disabled
[ 0.000000] 7 disabled
[ 0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[ 0.000000] e820 update range: 00000000cfe00000 - 000000042f000000 (usable) ==> (reserved)
[ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 13040MB of RAM.
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: at /build/buildd/linux-2.6.35/arch/x86/kernel/cpu/mtrr/cleanup.c:971 mtrr_trim_uncached_memory+0x2d8/0x303()
[ 0.000000] Hardware name: GA-970A-UD3
[ 0.000000] Modules linked in:
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.35-22-generic #33-Ubuntu
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff8106077f>] warn_slowpath_common+0x7f/0xc0
[ 0.000000] [<ffffffff810607da>] warn_slowpath_null+0x1a/0x20
[ 0.000000] [<ffffffff81af7970>] mtrr_trim_uncached_memory+0x2d8/0x303
[ 0.000000] [<ffffffff81af2910>] setup_arch+0x422/0x79e
[ 0.000000] [<ffffffff815864c9>] ? printk+0x68/0x6f
[ 0.000000] [<ffffffff81aed9f3>] start_kernel+0xdd/0x390
[ 0.000000] [<ffffffff81aed341>] x86_64_start_reservations+0x12c/0x130
[ 0.000000] [<ffffffff81aed43f>] x86_64_start_kernel+0xfa/0x109
[ 0.000000] ---[ end trace a7919e7f17c0a725 ]---
[ 0.000000] update e820 for mtrr
dmidecode -t memory:
# dmidecode 2.9
SMBIOS 2.4 present.
Handle 0x0005, DMI type 5, 24 bytes
Memory Controller Information
Error Detecting Method: 64-bit ECC
Error Correcting Capabilities:
None
Supported Interleave: One-way Interleave
Current Interleave: One-way Interleave
Maximum Memory Module Size: 1024 MB
Maximum Total Memory Size: 4096 MB
Supported Speeds:
70 ns
60 ns
Supported Memory Types:
Standard
EDO
Memory Module Voltage: 3.3 V
Associated Memory Slots: 4
0x0006
0x0007
0x0008
0x0009
Enabled Error Correcting Capabilities:
None
Handle 0x0006, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: A0
Bank Connections: 1
Current Speed: 53 ns
Type: Other Unknown EDO
Installed Size: 4096 MB (Double-bank Connection)
Enabled Size: 4096 MB (Double-bank Connection)
Error Status: OK
Handle 0x0007, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: A1
Bank Connections: 2
Current Speed: 53 ns
Type: Other Unknown EDO
Installed Size: 4096 MB (Double-bank Connection)
Enabled Size: 4096 MB (Double-bank Connection)
Error Status: OK
Handle 0x0008, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: A2
Bank Connections: 3
Current Speed: 53 ns
Type: Other Unknown EDO
Installed Size: 4096 MB (Double-bank Connection)
Enabled Size: 4096 MB (Double-bank Connection)
Error Status: OK
Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: A3
Bank Connections: 4
Current Speed: 53 ns
Type: Other Unknown EDO
Installed Size: 4096 MB (Double-bank Connection)
Enabled Size: 4096 MB (Double-bank Connection)
Error Status: OK
Handle 0x0029, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 16 GB
Error Information Handle: Not Provided
Number Of Devices: 4
Handle 0x002A, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: A0
Bank Locator: Bank0/1
Type: Unknown
Type Detail: None
Speed: 1333 MHz (0.8 ns)
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
Handle 0x002B, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: A1
Bank Locator: Bank2/3
Type: Unknown
Type Detail: None
Speed: 1333 MHz (0.8 ns)
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
Handle 0x002C, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: A2
Bank Locator: Bank4/5
Type: Unknown
Type Detail: None
Speed: 1333 MHz (0.8 ns)
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
Handle 0x002D, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: A3
Bank Locator: Bank6/7
Type: Unknown
Type Detail: None
Speed: 1333 MHz (0.8 ns)
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
uname -a
Linux artemis 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:32:27 UTC 2010 x86_64 GNU/Linux