On Tue, Feb 25, 2020 at 01:49:34PM -0800, Andy Lutomirski wrote:
> On Sun, Feb 23, 2020 at 2:52 PM Stefan Schaeckeler <schaecsn@gmx.net> wrote:
> >
> > This patch is based on Andy Lutomirski's iMC SMBus driver patch-set
> > https://lkml.org/lkml/2016/4/28/926. It never made it into the kernel. I hope
> > this rewrite will:
> >
> >
> > Overview
> >
> > Modern Intel memory controllers host an SMBus controller and connection to
> > DIMMs and their thermal sensors. The memory controller firmware has three modes
> > of operation: Closed Loop Thermal Throttling (CLTT), Open Loop Thermal
> > Throttling (OLTT) and none.
> >
> > - CLTT: The memory controller firmware is periodically accessing the DIMM
> >   temperature sensor over the SMBus.
> >
> 
> 
> I think this is great!  One question, though: what happens if the
> system is in CLTT mode but you disable CLTT and claim the bus for too
> long?  For example, if there's an infinite loop or other lockup which
> you have the tsod polling interval set to 0?  Does the system catch
> fire or does the system do something intelligent like temporarily
> switching to open loop?

Any news on this question?