Re: [PATCH] x86/topology: Fallback to SMT level only once

[Jiri Olsa]

On Mon, Aug 29, 2016 at 12:40:47PM +0200, Peter Zijlstra wrote:
> On Sun, Aug 28, 2016 at 08:19:46PM +0200, Jiri Olsa wrote:
> > Jirka, Peter and Jean-Pierre reported performance drop on
> > some cpus after making cpu offline and online again.
> > 
> > The reason is the kernel logic that falls back to SMT
> > level topology if more than one node is detected within
> > CPU package. During the system boot this logic cuts out
> > the DIE topology level and numa code adds NUMA level
> > on top of this.
> 
> Its not SMT topology, and back when I asked if he had CoD enabled or
> such he said not.
> 
> 
> See also:
> 
> http://lkml.kernel.org/r/1471559812-19967-3-git-send-email-srinivas.pandruvada@xxxxxxxxxxxxxxx
> 
> Arguably, that should have been split in two patches, but alas..

ok, that change will work for us as well

are you going to pull it?

thanks,
jirka