Hi,

I try to use Instruction Based Sampling (IBS) on a Dell PowerEdge R7425 machine equipped with 2 EPYC 7451 cpu running on Debian buster (Linux kernel 4.16.0.2, gcc 7.3.0), but Linux kernel does not detect that the CPU is capable of doing IBS.

According to AMD developers, the BIOS needs to perform a series of things to enable IBS on this CPU model, and there may be an option in the BIOS to enable IBS.

So, I updated the BIOS to the latest available version (version 1.3.6), and searched for such an option, but I couldn't find one. 

Is there a BIOS option on R7425 for enabling IBS ?

If not, could you add one ? According to the AMD developers, "[they] make IBS enable/disable available as part of [their] AGESA system that [they] release to BIOS vendors, so it should not be a particularly large amount of work "

Thanks.

François