pcie_bw(9)

💅 pcie_bw

okay bestie, this is the pcie_bw(9) page from the Kernel API Manual, and it's literally about checking the PCIe traffic vibes from the amdgpu driver. 💖

The amdgpu driver gives you a sysfs API for estimating how much data the GPU has received and sent in the last second through PCIe. The file pcie_bw is what you use for this. ✨

The Perf counters count the number of received and sent messages and return those values, plus the maximum payload size of a PCIe packet (mps). 🎀

heads up, bestie: it is not possible to easily and quickly obtain the size of each packet transmitted, so the output gives you the max payload size (mps) instead — that way you can make a quick estimation of PCIe bandwidth usage. no cap. 👑

✨ SEE ALSO ✨

• Kernel file: ./drivers/gpu/drm/amd/pm/amdgpu_pm.c
• amdgpu_pm_dev_state_check(9)
• amdgpu_pm_get_access(9)
• amdgpu_pm_get_access_if_active(9)
• amdgpu_pm_put_access(9)
• power_dpm_state(9)
• power_dpm_force_performance_level(9)
• pp_table(9)
• pp_od_clk_voltage(9)
• pp_features(9)
• pp_dpm_sclk
• pp_dpm_mclk
• pp_dpm_socclk
• pp_dpm_fclk
• pp_dpm_dcefclk
• pp_dpm_pcie(9)
• pp_power_profile_mode(9)
• gpu_busy_percent(9)
• mem_busy_percent(9)
• vcn_busy_percent(9)
• unique_id(9)
• thermal_throttling_logging(9)
• apu_thermal_cap(9)
• gpu_metrics(9)
• smartshift_apu_power(9)
• smartshift_dgpu_power(9)
• smartshift_bias(9)
• board(9)
• baseboard_temp(9)
• gpuboard_temp(9)
• cur_node_power_limit(9)
• node_power(9)
• npm_status(9)
• global_ppt_resid(9)
• max_node_power_limit(9)
• baseboard_power(9)
• baseboard_power_limit(9)
• pm_policy(9)
• hwmon(9)
• fan_curve(9)
• acoustic_limit_rpm_threshold(9)
• acoustic_target_rpm_threshold(9)
• fan_target_temperature(9)
• fan_minimum_pwm(9)
• fan_zero_rpm_enable(9)
• fan_zero_rpm_stop_temperature(9)

this cutie is sourced from ./drivers/gpu/drm/amd/pm, dated October 2026, and it’s the pcie_bw(9) page — periodt. 💅🫶