On Tue, Jun 18, 2024 at 03:25:36PM -0500, Aaron Rainbolt wrote: > acpi: Allow ignoring _OSC CPPC v2 bit via kernel parameter > > The _OSC is supposed to contain a bit indicating whether the hardware > supports CPPC v2 or not. This bit is not always set, causing CPPC v2 to > be considered absent. This results in severe single-core performance > issues with the EEVDF scheduler on heterogenous-core Intel processors. > > To work around this, provide a new kernel parameter, "ignore_osc_cppc_bit", > which may be used to ignore the _OSC CPPC v2 bit and act as if the bit was > enabled. This allows CPPC to be properly detected even if not "enabled" by > _OSC, allowing users with problematic hardware to obtain decent single-core > performance. > > Signed-off-by: Aaron Rainbolt <arainbolt@xxxxxxxxxx> > > --- > > V1 -> V2: Rewrite to work in cpc_supported_by_cpu. > > RFC: I have not yet tested this patch to ensure it functions properly, > nor have I attempted to compile it against mainline. My system takes > a couple of hours or so to build a kernel, and I'd like to submit this > for feedback now and test once it's sent. I sped up my build by using a defconfig rather than a default menuconfig (still learning how these things work), and confirmed that the patch does build against 6.10~rc4. Will report back test results hopefully soon.
