rootflags='data=writeback' enable_mtrr_cleanup preempt='full' nohz='off' acpi_osi='Linux' tsc='nowatchdog' iomem='relaxed' pcie_aspm='off' pcie_port_pm='off' pcie_ports='native' pci='nocrs,pcie_bus_perf,realloc,pcie_scan_all,big_root_window' swiotlb='noforce' iommu='force' intel_iommu='on' reboot='pci' ahci.mobile_lpm_policy='1' nvme_core.default_ps_max_latency_us='0' nowatchdog modprobe.blacklist='iTCO_wdt' usbcore.autosuspend='-1' iwlmvm.power_scheme='1' snd_hda_intel.power_save='0' i915.enable_fbc='0' i915.enable_psr='0' i915.panel_use_ssc='0' i915.enable_guc='3' i915.guc_log_level='0' nvme.noacpi='1' nvme.use_threaded_interrupts='1' nvme.poll_queues='4'
I occasionally look at dmesg to see if anything looks like it could be changed or fixed, and then try some parameters to do it 
I particularly don’t like any form of power-saving as it’s unpredictable for little gain (I’m already on a low-power mobile platform). I like theoretical throughput (pci stuff). Some stuff just sounds good and doesn’t seemingly cause any problems