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Old 04-26-2009, 12:04 PM   #1
Theimon
LQ Newbie
 
Registered: Apr 2008
Posts: 4

Rep: Reputation: 0
AMD64 X2 7750 on Gentoo 32bits/Linux 2.6.29: No L3 Cache?

I installed this cpu just this afternoon. It booted without problems and it gets recognized with correct name and everything. See /proc/cpuinfo
Code:
processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 16
model		: 2
model name	: AMD Athlon(tm) 7750 Dual-Core Processor
stepping	: 3
cpu MHz		: 2713.666
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc pni monitor cx16 lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs
bogomips	: 5427.33
clflush size	: 64
power management: ts ttp tm stc 100mhzsteps hwpstate

processor	: 1
vendor_id	: AuthenticAMD
cpu family	: 16
model		: 2
model name	: AMD Athlon(tm) 7750 Dual-Core Processor
stepping	: 3
cpu MHz		: 2713.666
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 1
cpu cores	: 2
apicid		: 1
initial apicid	: 1
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc pni monitor cx16 lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs
bogomips	: 5427.18
clflush size	: 64
power management: ts ttp tm stc 100mhzsteps hwpstate
This cpu has a shared L3 cache of 2MB, but looking through dmidecode, it doesn't show up:
Code:
# dmidecode 2.10
SMBIOS 2.3 present.
43 structures occupying 2190 bytes.
Table at 0x000F0100.

Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
	Vendor: Award Software International, Inc.
	Version: FI
	Release Date: 03/07/2008
	Address: 0xE0000
	Runtime Size: 128 kB
	ROM Size: 512 kB
	Characteristics:
		PCI is supported
		PNP is supported
		APM is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		Boot from CD is supported
		Selectable boot is supported
		BIOS ROM is socketed
		EDD is supported
		5.25"/360 kB floppy services are supported (int 13h)
		5.25"/1.2 MB floppy services are supported (int 13h)
		3.5"/720 kB floppy services are supported (int 13h)
		3.5"/2.88 MB floppy services are supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		CGA/mono video services are supported (int 10h)
		ACPI is supported
		USB legacy is supported
		LS-120 boot is supported
		ATAPI Zip drive boot is supported
		BIOS boot specification is supported

Handle 0x0001, DMI type 1, 25 bytes
System Information
	Manufacturer:  
	Product Name:  
	Version:  
	Serial Number:  
	UUID: Not Present
	Wake-up Type: Power Switch

Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
	Manufacturer: Gigabyte Technology Co., Ltd.
	Product Name: M55S-S3
	Version:  
	Serial Number:  

Handle 0x0003, DMI type 3, 17 bytes
Chassis Information
	Manufacturer:  
	Type: Desktop
	Lock: Not Present
	Version:  
	Serial Number:  
	Asset Tag:  
	Boot-up State: Unknown
	Power Supply State: Unknown
	Thermal State: Unknown
	Security Status: Unknown
	OEM Information: 0x00000000

Handle 0x0004, DMI type 4, 35 bytes
Processor Information
	Socket Designation: Socket M2
	Type: Central Processor
	Family: Athlon
	Manufacturer: AMD
	ID: 23 0F 10 00 FF FB 8B 17
	Signature: Family 16, Model 2, Stepping 3
	Flags:
		FPU (Floating-point unit on-chip)
		VME (Virtual mode extension)
		DE (Debugging extension)
		PSE (Page size extension)
		TSC (Time stamp counter)
		MSR (Model specific registers)
		PAE (Physical address extension)
		MCE (Machine check exception)
		CX8 (CMPXCHG8 instruction supported)
		APIC (On-chip APIC hardware supported)
		SEP (Fast system call)
		MTRR (Memory type range registers)
		PGE (Page global enable)
		MCA (Machine check architecture)
		CMOV (Conditional move instruction supported)
		PAT (Page attribute table)
		PSE-36 (36-bit page size extension)
		CLFSH (CLFLUSH instruction supported)
		MMX (MMX technology supported)
		FXSR (Fast floating-point save and restore)
		SSE (Streaming SIMD extensions)
		SSE2 (Streaming SIMD extensions 2)
		HTT (Hyper-threading technology)
	Version: AMD Athlon(tm) 7750 Dual-Core Processor
	Voltage: 1.3 V
	External Clock: 200 MHz
	Max Speed: 3200 MHz
	Current Speed: 2700 MHz
	Status: Populated, Enabled
	Upgrade: ZIF Socket
	L1 Cache Handle: 0x000B
	L2 Cache Handle: 0x000D
	L3 Cache Handle: Not Provided
	Serial Number:  
	Asset Tag:  
	Part Number:  

Handle 0x0005, DMI type 4, 35 bytes
Processor Information
	Socket Designation: Socket M2
	Type: Central Processor
	Family: Athlon
	Manufacturer: AMD
	ID: 23 0F 10 00 FF FB 8B 17
	Signature: Family 16, Model 2, Stepping 3
	Flags:
		FPU (Floating-point unit on-chip)
		VME (Virtual mode extension)
		DE (Debugging extension)
		PSE (Page size extension)
		TSC (Time stamp counter)
		MSR (Model specific registers)
		PAE (Physical address extension)
		MCE (Machine check exception)
		CX8 (CMPXCHG8 instruction supported)
		APIC (On-chip APIC hardware supported)
		SEP (Fast system call)
		MTRR (Memory type range registers)
		PGE (Page global enable)
		MCA (Machine check architecture)
		CMOV (Conditional move instruction supported)
		PAT (Page attribute table)
		PSE-36 (36-bit page size extension)
		CLFSH (CLFLUSH instruction supported)
		MMX (MMX technology supported)
		FXSR (Fast floating-point save and restore)
		SSE (Streaming SIMD extensions)
		SSE2 (Streaming SIMD extensions 2)
		HTT (Hyper-threading technology)
	Version: AMD Athlon(tm) 7750 Dual-Core Processor
	Voltage: 1.3 V
	External Clock: 200 MHz
	Max Speed: 3200 MHz
	Current Speed: 2700 MHz
	Status: Populated, Enabled
	Upgrade: ZIF Socket
	L1 Cache Handle: 0x000C
	L2 Cache Handle: 0x000E
	L3 Cache Handle: Not Provided
	Serial Number:  
	Asset Tag:  
	Part Number:  

Handle 0x0006, 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
		0x0007
		0x0008
		0x0009
		0x000A
	Enabled Error Correcting Capabilities:
		None

Handle 0x0007, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: A0
	Bank Connections: 1
	Current Speed: 32 ns
	Type: Other Unknown EDO
	Installed Size: 2048 MB (Double-bank Connection)
	Enabled Size: 2048 MB (Double-bank Connection)
	Error Status: OK

Handle 0x0008, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: A1
	Bank Connections: 2
	Current Speed: 32 ns
	Type: Other Unknown EDO
	Installed Size: 2048 MB (Double-bank Connection)
	Enabled Size: 2048 MB (Double-bank Connection)
	Error Status: OK

Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: A2
	Bank Connections: 3
	Current Speed: 32 ns
	Type: Other Unknown EDO
	Installed Size: Not Installed
	Enabled Size: Not Installed
	Error Status: OK

Handle 0x000A, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: A3
	Bank Connections: 4
	Current Speed: 32 ns
	Type: Other Unknown EDO
	Installed Size: Not Installed
	Enabled Size: Not Installed
	Error Status: OK

Handle 0x000B, DMI type 7, 19 bytes
Cache Information
	Socket Designation: Internal Cache
	Configuration: Enabled, Not Socketed, Level 1
	Operational Mode: Write Back
	Location: Internal
	Installed Size: 128 kB
	Maximum Size: 128 kB
	Supported SRAM Types:
		Synchronous
	Installed SRAM Type: Synchronous
	Speed: Unknown
	Error Correction Type: Unknown
	System Type: Unknown
	Associativity: Unknown

Handle 0x000C, DMI type 7, 19 bytes
Cache Information
	Socket Designation: Internal Cache
	Configuration: Enabled, Not Socketed, Level 1
	Operational Mode: Write Back
	Location: Internal
	Installed Size: 128 kB
	Maximum Size: 128 kB
	Supported SRAM Types:
		Synchronous
	Installed SRAM Type: Synchronous
	Speed: Unknown
	Error Correction Type: Unknown
	System Type: Unknown
	Associativity: Unknown

Handle 0x000D, DMI type 7, 19 bytes
Cache Information
	Socket Designation: External Cache
	Configuration: Enabled, Not Socketed, Level 2
	Operational Mode: Write Back
	Location: Internal
	Installed Size: 512 kB
	Maximum Size: 512 kB
	Supported SRAM Types:
		Synchronous
	Installed SRAM Type: Synchronous
	Speed: Unknown
	Error Correction Type: Unknown
	System Type: Unknown
	Associativity: Unknown

Handle 0x000E, DMI type 7, 19 bytes
Cache Information
	Socket Designation: External Cache
	Configuration: Disabled, Not Socketed, Level 2
	Operational Mode: Write Through
	Location: Internal
	Installed Size: 0 kB
	Maximum Size: 1024 kB
	Supported SRAM Types:
		Synchronous
	Installed SRAM Type: Synchronous
	Speed: Unknown
	Error Correction Type: Unknown
	System Type: Unknown
	Associativity: Unknown

Handle 0x000F, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: PRIMARY IDE
	Internal Connector Type: On Board IDE
	External Reference Designator:  
	External Connector Type: None
	Port Type: Other

Handle 0x0010, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: SECONDARY IDE
	Internal Connector Type: On Board IDE
	External Reference Designator:  
	External Connector Type: None
	Port Type: Other

Handle 0x0011, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: FDD
	Internal Connector Type: On Board Floppy
	External Reference Designator:  
	External Connector Type: None
	Port Type: 8251 FIFO Compatible

Handle 0x0012, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: COM1
	Internal Connector Type: 9 Pin Dual Inline (pin 10 cut)
	External Reference Designator:  
	External Connector Type: DB-9 male
	Port Type: Serial Port 16450 Compatible

Handle 0x0013, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: COM2
	Internal Connector Type: 9 Pin Dual Inline (pin 10 cut)
	External Reference Designator:  
	External Connector Type: DB-9 male
	Port Type: Serial Port 16450 Compatible

Handle 0x0014, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: LPT1
	Internal Connector Type: DB-25 female
	External Reference Designator:  
	External Connector Type: DB-25 female
	Port Type: Parallel Port ECP/EPP

Handle 0x0015, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: Keyboard
	Internal Connector Type: Other
	External Reference Designator:  
	External Connector Type: PS/2
	Port Type: Keyboard Port

Handle 0x0016, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: PS/2 Mouse
	Internal Connector Type: PS/2
	External Reference Designator: Detected
	External Connector Type: PS/2
	Port Type: Mouse Port

Handle 0x0017, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: USB
	Internal Connector Type: None
	External Reference Designator:  
	External Connector Type: Access Bus (USB)
	Port Type: USB

Handle 0x0018, DMI type 9, 13 bytes
System Slot Information
	Designation: PCI
	Type: 32-bit PCI
	Current Usage: Available
	Length: Long
	ID: 6
	Characteristics:
		5.0 V is provided
		3.3 V is provided
		PME signal is supported
		SMBus signal is supported

Handle 0x0019, DMI type 9, 13 bytes
System Slot Information
	Designation: PCI
	Type: 32-bit PCI
	Current Usage: Available
	Length: Long
	ID: 7
	Characteristics:
		5.0 V is provided
		3.3 V is provided
		PME signal is supported
		SMBus signal is supported

Handle 0x001A, DMI type 13, 22 bytes
BIOS Language Information
	Installable Languages: 3
		n|US|iso8859-1
		n|US|iso8859-1
		r|CA|iso8859-1
	Currently Installed Language: n|US|iso8859-1

Handle 0x001B, DMI type 16, 15 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 2 GB
	Error Information Handle: Not Provided
	Number Of Devices: 4

Handle 0x001C, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x001B
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: None
	Locator: A0
	Bank Locator: Bank0/1
	Type: Unknown
	Type Detail: None
	Speed: 800 MHz
	Manufacturer:  
	Serial Number:  
	Asset Tag:  
	Part Number:  

Handle 0x001D, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x001B
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: None
	Locator: A1
	Bank Locator: Bank2/3
	Type: Unknown
	Type Detail: None
	Speed: 800 MHz
	Manufacturer:  
	Serial Number:  
	Asset Tag:  
	Part Number:  

Handle 0x001E, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x001B
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: No Module Installed
	Form Factor: DIMM
	Set: None
	Locator: A2
	Bank Locator: Bank4/5
	Type: Unknown
	Type Detail: None
	Speed: 800 MHz
	Manufacturer:  
	Serial Number:  
	Asset Tag:  
	Part Number:  

Handle 0x001F, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x001B
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: No Module Installed
	Form Factor: DIMM
	Set: None
	Locator: A3
	Bank Locator: Bank6/7
	Type: Unknown
	Type Detail: None
	Speed: 800 MHz
	Manufacturer:  
	Serial Number:  
	Asset Tag:  
	Part Number:  

Handle 0x0020, DMI type 19, 15 bytes
Memory Array Mapped Address
	Starting Address: 0x00000000000
	Ending Address: 0x000FFFFFFFF
	Range Size: 4 GB
	Physical Array Handle: 0x001B
	Partition Width: 32

Handle 0x0021, DMI type 20, 19 bytes
Memory Device Mapped Address
	Starting Address: 0x00000000000
	Ending Address: 0x0007FFFFFFF
	Range Size: 2 GB
	Physical Device Handle: 0x001C
	Memory Array Mapped Address Handle: 0x0020
	Partition Row Position: 1

Handle 0x0022, DMI type 20, 19 bytes
Memory Device Mapped Address
	Starting Address: 0x00080000000
	Ending Address: 0x000FFFFFFFF
	Range Size: 2 GB
	Physical Device Handle: 0x001D
	Memory Array Mapped Address Handle: 0x0020
	Partition Row Position: 1

Handle 0x0023, DMI type 20, 19 bytes
Memory Device Mapped Address
	Starting Address: 0x00000000000
	Ending Address: 0x000000003FF
	Range Size: 1 kB
	Physical Device Handle: 0x001E
	Memory Array Mapped Address Handle: 0x0020
	Partition Row Position: 1

Handle 0x0024, DMI type 20, 19 bytes
Memory Device Mapped Address
	Starting Address: 0x00000000000
	Ending Address: 0x000000003FF
	Range Size: 1 kB
	Physical Device Handle: 0x001F
	Memory Array Mapped Address Handle: 0x0020
	Partition Row Position: 1

Handle 0x0025, DMI type 32, 11 bytes
System Boot Information
	Status: No errors detected

Handle 0x0026, DMI type 188, 244 bytes
OEM-specific Type
	Header and Data:
		BC F4 26 00 00 00 00 D0 00 00 00 00 00 00 00 30
		01 00 00 00 00 06 76 00 00 00 00 00 08 00 00 00
		00 40 40 00 10 08 01 00 0B 00 58 7F 03 00 00 00
		00 00 2F 01 00 00 00 00 01 00 00 00 00 00 00 00
		02 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00
		04 00 00 00 00 00 00 00 05 00 00 00 00 00 00 00
		06 00 00 00 00 00 00 00 07 00 00 00 03 30 00 D0
		00 00 00 00 00 00 00 00 13 10 00 00 00 F0 0F 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		03 00 00 FF 01 00 00 00 01 02 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 E0 3D F8 00 00 00 00 00 00 00 00 00
		00 00 00 00 05 00 41 0D 00 00 00 00 05 00 00 00
		00 00 00 00 24 FA 7D 00 34 03 22 00 10 08 01 00
		00 02 00 00 00 00 00 00 44 00 90 0A 0B 00 58 7F
		00 00 00 00

Handle 0x0027, DMI type 190, 212 bytes
OEM-specific Type
	Header and Data:
		BE D4 27 00 10 05 00 00 00 00 00 00 24 A4 40 04
		C0 0F E4 2F 00 00 00 00 00 00 00 00 25 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 21 F3 B7 22 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00

Handle 0x0028, DMI type 192, 244 bytes
OEM-specific Type
	Header and Data:
		C0 F4 28 00 05 00 00 00 22 32 11 20 20 25 20 00
		E7 88 71 0E FC 0E 0D 00 22 32 11 20 0F 10 12 10
		0F 10 12 10 0F 10 12 10 10 11 0F 11 10 11 0F 11
		10 11 0F 11 0F 00 0F 20 25 20 00 12 10 10 10 12
		10 10 10 12 10 10 10 10 10 12 12 10 10 12 12 10
		10 12 12 12 00 12 A8 9C 82 0C FC 0E 0D 00 4E 00
		4D 00 4C 00 46 00 4E 00 0E 00 0D 00 0C 00 06 00
		00 00 0E 00 0D 00 0C 00 06 00 00 00 0E 00 0D 00
		0C 00 06 00 00 00 48 00 49 00 4A 00 4E 00 00 00
		08 00 09 00 0A 00 0E 00 00 00 08 00 09 00 0A 00
		0E 00 00 00 08 00 09 00 0A 00 0E 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 16 15 16 14 15 15 16 16 16 00 00 00
		C5 01 00 00 DC 01 00 00 DC 01 00 00 DC 01 00 00
		00 00 00 00

Handle 0x0029, DMI type 194, 244 bytes
OEM-specific Type
	Header and Data:
		C2 F4 29 00 05 00 00 00 22 32 11 20 20 25 20 00
		A9 9C 92 0C FC 0E 0E 00 22 32 11 20 11 10 11 0F
		11 10 11 0F 11 10 11 0F 0F 10 0F 10 0F 10 0F 10
		0F 10 0F 10 11 00 11 20 25 20 00 10 12 12 12 10
		12 12 12 10 12 12 12 12 10 12 12 12 10 12 12 12
		10 12 12 10 00 10 AA A8 C2 0C FC 0E 0E 00 53 00
		51 00 4D 00 4A 00 53 00 13 00 11 00 0D 00 0A 00
		00 00 13 00 11 00 0D 00 0A 00 00 00 13 00 11 00
		0D 00 0A 00 00 00 4A 00 4C 00 50 00 52 00 00 00
		0A 00 0C 00 10 00 12 00 00 00 0A 00 0C 00 10 00
		12 00 00 00 0A 00 0C 00 10 00 12 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
		00 00 00 00 17 17 16 16 16 16 17 17 16 00 00 00
		3C 01 00 00 DC 01 00 00 DC 01 00 00 DC 01 00 00
		00 00 00 00

Handle 0x002A, DMI type 127, 4 bytes
End Of Table
I am now unsure if the L3 cache is enabled and, if not, how to enable it at all.

Motherboard: Gigabyte GA-M55S-S3 rev 2.0 (BIOS version FI)
CPU: AMD Athlon64 X2 7750 Black Edition
RAM: Kingston Valueram 2x2GB CL5

If you need anymore info, I'll be happy to provide it of course.
 
Old 04-26-2009, 06:31 PM   #2
thorkelljarl
Senior Member
 
Registered: Jun 2008
Posts: 1,820

Rep: Reputation: 229Reputation: 229Reputation: 229
A good and relevant question at last
-or-
I have the same CPU and wondered myself

My 7750 is on a GA-M56S-S3 socket AM2 mother board, and the L3 cache is reported neither with the command "dmidecode" nor "lshw".

However, I found this, which seem to me to indicate that the problem is that the cache is not registered rather than that the cache is not activated.

http://lkml.org/lkml/2009/4/2/171

Using "cat", I found this on my system, seeming to indicate that my L3 cache is active. This seems to be for one core; there is the same for cpu1, but the L3 cache is shared. I am using openSUSE 11.0

xxxxxxxxxx@generic-hostname:~> cat /sys/devices/system/cpu/cpu0/cache/index3/*
64
3
1024
1
00000000,00000000,00000000,00000003
2048K
Unified
32
xxxxxxxxxx@generic-hostname:~>

You might try a similar cat command on yours, or just follow the file sequence down to the CPU.


As a matter of simple hubris, I replaced a well functioning AMD X2 4800+ CPU with an all too cheap AMD 7750 and things quickened a bit. I do not know if this was because of the L3 cache, because of the Kuma core of the 7750, or because after I paid money I wanted it to happen.
Last edited by thorkelljarl; 11-12-2009 at 01:09 PM.
 
Old 04-27-2009, 01:07 PM   #3
Theimon
LQ Newbie
 
Registered: Apr 2008
Posts: 4

Original Poster
Rep: Reputation: 0
The result of the exact same cat command:
Code:
know-where-to-run linux-2.6.30-rc3-git1 # cat /sys/devices/system/cpu/cpu0/cache/index3/*
Entry: 0
Reads:  Allowed	New Entries: Allowed
SubCache: 0	Index: 0
Entry: 1
Reads:  Allowed	New Entries: Allowed
SubCache: 0	Index: 0
64
3
1024
1
0-1
3
2048K
Unified
32
So indeed there is a sign of life for the L3 cache. I do think because of the lack of support for the K10 core, things might not get reported/detected properly. Sadly enough in the 2.6.30 git releases I see nog signs of even basic support for this core yet. I do hope the devs get around to this.
I myself replaced a X2 4200+ with this 7750. I noticed a slight speedup at boot and when compiling stuff. Overall performance seems better, but that's a combination of the new cpu and and extra 2GB of RAM on top of the 2GB I already had.
Of course, if anyone can explain or help with this matter....I'm still open for suggestions
 
Old 04-28-2009, 08:24 PM   #4
thorkelljarl
Senior Member
 
Registered: Jun 2008
Posts: 1,820

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I looked further.

I looked at my boot log in /var/log/boot.msg and, whereas I can see that L1 of 64K and L2 of 512K is mentioned for each core, I could find nothing about L3 or its expected size. Again, it may be activated but not reported there or simply not be activated at all, unless I can't find it. Where is that Andrew Morton when he is needed?
 
Old 04-29-2009, 12:33 AM   #5
Theimon
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And again, same here. /var/log/messages and /var/log/dmesg are both showing me L1 and L2 but no L3 cache.

I'm hoping for proper K10 support in the upcoming kernel releases. Maybe then we can take full advantage of this cpu's features.
 
Old 04-29-2009, 08:07 AM   #6
thorkelljarl
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In my tower cabinet...

On my AMD X2 7750 I installed an Arctic Cooling Alpine 64 PWM CPU cooler. It runs at about 1000 RPM, is quiet, holds the temperature to just under 40 degrees centigrade, and was not expensive.

Any similar high capacity cooler would do as well.

All readers may consider this post a rant.
 
  


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