On Mon, Sep 06, 2021 at 03:01:12PM +0200, Jan Beulich wrote: > From: Artem Bityutskiy <artem.bityuts...@linux.intel.com> > > Change IceLake Xeon C6 latency from 128 us to 170 us. The latency > was measured with the "wult" tool and corresponds to the 99.99th > percentile when measuring with the "nic" method. Note, the 128 us > figure correspond to the median latency, but in intel_idle we use > the "worst case" latency figure instead. > > C6 target residency was increased from 384 us to 600 us, which may > result in less C6 residency in some workloads. This value was tested > and compared to values 384, and 1000. Value 600 is a reasonable > tradeoff between power and performance. > > Signed-off-by: Artem Bityutskiy <artem.bityuts...@linux.intel.com> > Acked-by: Zhang Rui <rui.zh...@intel.com> > Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > [Linux commit: d484b8bfc6fa71a088e4ac85d9ce11aa0385867e] > Signed-off-by: Jan Beulich <jbeul...@suse.com>
Acked-by: Roger Pau Monné <roger....@citrix.com> AFAICT those values are all from measurements, and not in any manual or specification? Thanks, Roger.
