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nukem996
l33t
Joined: 13 Nov 2003
Posts: 776
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 Posted: Thu Apr 05, 2012 9:05 am Post subject: Why is my L3 Cache Disabled? |
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When looking through dmidecode and lshw both report that my L3 cache is disabled. I have nothing set in my BIOS/EFI firmware to disable it. /sys/devices/cpu0/cache/level3 tells me its there but not if its used. I have an Intel i7 2600K which lists having 8M of L3 Cache. I've also tested with a Fedora 17 boot disk and see the same thing.
Anyone have any ideas? |
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Veldrin
Veteran
Joined: 27 Jul 2004
Posts: 1945
Location: Zurich, Switzerland
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| Posted: Thu Apr 05, 2012 12:01 pm Post subject: |
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what does lscpu say?
_________________
read the portage output!
If my answer is too concise, ask for an explanation. |
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roarinelk
Guru
Joined: 04 Mar 2004
Posts: 520
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| Posted: Thu Apr 05, 2012 12:50 pm Post subject: |
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forget dmidecode, it's reading a static database the bios vendor created some aeons ago.
It's as reliably as a politician.
I really really doubt L3 cache is disabled if your cpu has it. except for debugging the cpu
nobody would disable it willingly. |
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nukem996
l33t
Joined: 13 Nov 2003
Posts: 776
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| Posted: Fri Apr 06, 2012 1:11 am Post subject: |
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| Veldrin wrote: | | what does lscpu say? |
| Code: |
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 42
Stepping: 7
CPU MHz: 3411.106
BogoMIPS: 6822.21
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 8192K
NUMA node0 CPU(s): 0-7
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nukem996
l33t
Joined: 13 Nov 2003
Posts: 776
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| Posted: Fri Apr 06, 2012 1:12 am Post subject: |
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| roarinelk wrote: | forget dmidecode, it's reading a static database the bios vendor created some aeons ago.
It's as reliably as a politician.
I really really doubt L3 cache is disabled if your cpu has it. except for debugging the cpu
nobody would disable it willingly. |
I've learned not to trust hardware manufactures. While this is most likely whats happening I was wondering if there was any way to verify that my L3 cache is enabled? |
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