On Mon, Jul 30, 2018 at 03:00:29PM -0700, Srinivas Pandruvada wrote: > Dynamic boosting of HWP performance on IO wake showed significant > improvement to IO workloads. This series was intended for Skylake Xeon > platforms only and feature was enabled by default based on CPU model > number. > > But some Xeon platforms reused the Skylake desktop CPU model number. This > caused some undesirable side effects to some graphics workloads. Since > they are heavily IO bound, the increase in CPU performance decreased the > power available for GPU to do its computing and hence decrease in graphics > benchmark performance. > > For example on a Skylake desktop, GpuTest benchmark showed average FPS > reduction from 529 to 506. > > This change makes sure that HWP boost feature is only enabled for Skylake > server platforms by using ACPI FADT preferred PM Profile. If some desktop > users wants to get benefit of boost, they can still enable boost from > intel_pstate sysfs attribute "hwp_dynamic_boost". > > Fixes: 41ab43c9c89e (cpufreq: intel_pstate: enable boost for Skylake Xeon) > Link: https://bugs.freedesktop.org/show_bug.cgi?id=107410 > Reported-by: Eero Tamminen <[email protected]> > Signed-off-by: Srinivas Pandruvada <[email protected]>
Acked-by: Mel Gorman <[email protected]> -- Mel Gorman SUSE Labs
