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Linux Gurus: Why is my 3.6GHz CPU stuck at 2.5GHz?


Interstellar

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You have not told us what motherboard you are using, but it could be that it needs a firmware update to support that version of the processor.

 

M4A78LT-M

 

However it's absolutely fine in windows and clocks between 800MHz and 3.6GHz as it should.

 

This is a slackware/UnRAID issue...

 

The modules might be there but CPU frequency scaling is not a supported feature.

 

I very briefly messed with it on my Quad core intel but then I moved to ESXi and its not worth bothering with again.

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You have not told us what motherboard you are using, but it could be that it needs a firmware update to support that version of the processor.

 

M4A78LT-M

 

However it's absolutely fine in windows and clocks between 800MHz and 3.6GHz as it should.

 

This is a slackware/UnRAID issue...

 

The modules might be there but CPU frequency scaling is not a supported feature.

 

I very briefly messed with it on my Quad core intel but then I moved to ESXi and its not worth bothering with again.

 

Well currently that isn't even the problem.

 

Without any messing with the cpu governors, i.e. a stock UnRAID boot, my CPU freq is 2.5GHz not 3.6Ghz.

 

That is a issue, however you cut it!!!

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So you are trying to overclock the 3.2GHz CPU to 3.6?  Correct?

 

And even though it is overclocked to 3.6 it is showing as 2.5 in unRAID? Correct?

 

It sounds like you have loaded the modules and based on the governor you chose the CPU is being set to 2.5 which may very well be the speed the governor thinks is correct.

 

Short of the fact that you were expecting it to not be 2.5Ghz I am not understanding the problem.

 

Disable the CPU frequency scaling and see what the CPU reads then.

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So you are trying to overclock the 3.2GHz CPU to 3.6?  Correct?

 

And even though it is overclocked to 3.6 it is showing as 2.5 in unRAID? Correct?

 

It sounds like you have loaded the modules and based on the governor you chose the CPU is being set to 2.5 which may very well be the speed the governor thinks is correct.

 

Short of the fact that you were expecting it to not be 2.5Ghz I am not understanding the problem.

 

Disable the CPU frequency scaling and see what the CPU reads then.

 

Yes. cpu info is showing the freq to be 2.5Ghz with the chip at 3.6. This is fixed when I clock it back to 3.2, it shows it at 3.2.

 

I'm not touching anything to do with the cpu freq scaling! It's a stock UnRAID install on the USB stick.

 

Doesn't matter anyway, i've decided to go back to my original Athlon CPU.

 

The mobo can't even get a CPU which is known to be 100% stable at 4GHz with 1.4V to be stable at 3.2G with 1.45V.

 

Shame :(

 

 

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Yes. cpu info is showing the freq to be 2.5Ghz with the chip at 3.6. This is fixed when I clock it back to 3.2, it shows it at 3.2.

 

I'm not touching anything to do with the cpu freq scaling! It's a stock UnRAID install on the USB stick.

OK, I misunderstood a little bit and assumed you were messing with CPU frequency scaling in combination with overclocking

 

Doesn't matter anyway, i've decided to go back to my original Athlon CPU.

 

The mobo can't even get a CPU which is known to be 100% stable at 4GHz with 1.4V to be stable at 3.2G with 1.45V.

Overclocking a CPU to 4Ghz that will be used with unRAID is completely and utterly pointless for 99% of the tasks you will use an unRAID server for.

 

Overclock my Quad Intel might get me something but I run a fair number of things on my server, not to mention the fact that it is an ESXi box with virtual unRAID.

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Yes. cpu info is showing the freq to be 2.5Ghz with the chip at 3.6. This is fixed when I clock it back to 3.2, it shows it at 3.2.

 

I'm not touching anything to do with the cpu freq scaling! It's a stock UnRAID install on the USB stick.

OK, I misunderstood a little bit and assumed you were messing with CPU frequency scaling in combination with overclocking

 

Doesn't matter anyway, i've decided to go back to my original Athlon CPU.

 

The mobo can't even get a CPU which is known to be 100% stable at 4GHz with 1.4V to be stable at 3.2G with 1.45V.

Overclocking a CPU to 4Ghz that will be used with unRAID is completely and utterly pointless for 99% of the tasks you will use an unRAID server for.

 

Overclock my Quad Intel might get me something but I run a fair number of things on my server, not to mention the fact that it is an ESXi box with virtual unRAID.

 

I wasn't really planning to keep it as a quad, I wanted it to be a 4GHz dual as read/write performance, especially to the cache drive & PS3MS is streaming improves well beyond 3GHz.

 

Decided to give clocking the Athlon a go, managed 3.3Ghz at .05V less than stock, currently stress testing the CPU for 50 linpack cycles (~13 hours @ max load) using all 8GB, nothing stresses a CPU like that does :D

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