Re: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lockif possible

[Ingo Molnar]

* Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:

> > > > By doing the above the BIOS should release the performance counter, and 
> > > > the kernel's "perf" should not encounter a conflict.
> > > > 
> > > > The document that you are looking for is here: (please see page 8 and 
> > > > later): 
> > > > http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01804533/c01804533.pdf
> 
> Thanks Peter !
> 
> I was not aware of the hidden "CTRL-A" feature on RBSU, so I never met these 
> configuration settings ("Service Options" added in main menu)
> 
> I already was in "Power regulator mode : Static High mode" QPI Link power 
> management : Disabled
> 
> I have latest released I24 BIOS
> DMI: HP ProLiant BL460c G6, BIOS I24 01/29/2011
> 
> 1) I disabled "Power and Utilization Monitoring" _and_ "Memory
> Pre-Failure Notification"
> 
> Still I got the 'MSR 38d is 330' error
> 
> 2) I then disabled Intel Turbo boost
> 
> Same error
> 
> 3) Minimum Processor idle Power state
>   From C1E-State --> No C-states
> 
> Same error
> 
> Tricky isnt it ?

This kind of user-configurability reminds me of Mr. Prosser from the local 
council who wants to knock down Arthur Dentâs house with a bulldozer to make 
way for a new bypass:

 "But the plans were on display ..."

 "On display? I eventually had to go down to the cellar to find them."

 "That's the display department."

 "With a flashlight."

 "Ah, well the lights had probably gone."

 "So had the stairs."

 "But look, you found the notice didn't you?"

 "Yes," said Arthur, "yes I did. It was on display in the bottom of a locked 
  filing cabinet stuck in a disused lavatory with a sign on the door saying 
  'Beware of the Leopard'."

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/