Turn off "IO non posted prefetching" via IIO CSR

[idata]

Is it possible to disable the processor feature "IO non posted prefetching" by manipulating IIO Configuration Registers (as defined in the Xeon E5 2600 v3 datasheet) on a running Linux machine?

I understand that this is usually a BIOS setting but I am hoping to make an alternative implementation using the Linux 'setpci' utility for cases where the BIOS is not accessible or does not support this setting.

[EstebanA_C_Intel]

Hello lukegorrie,

Would you please provide me with the following information?

-OS used:

-Exact CPU model:

-Motherboard:

-Firmware/BIOS version:

With this information, I will have a clearer view of your system and therefore better assist you.

In the mean time, I am going to be investigating your inquiry

Regards,

Esteban C

[idata]

Hi Esteban,

I am looking for a solution that works on Linux (OS) and Xeon E5 2600 v3 family (CPU.)

I cannot be more specific because I am looking for a solution that does not depend on a specific motherboard or BIOS/firmware version.

[idata]

Hello lukegorrie,

I understand, thank you for the info provided.

Let me further check this matter, I will keep you updated.

Regards,

Esteban C

[NNeuf]

Hi,

We have a similar issue here and I'd be very interested to get a temporary solution while waiting for our platform provider to issue a proper BIOS. I can give the required info:

CPU: Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz

Mainboard: ASUS Z10PG-D16 Series

BIOS: American Megatrends Ver 3204, Rev 5.6

OS: CentOS Linux release 7.2.1511 (Core)

Kind regards,

Niko

[idata]

Hello Peers,

After digging deeper we got the result saying this cannot be achieved within the OS, sorry for any inconvenient.Regards,Esteban C