MT7902 (mt7921e): 3-4x lower throughput on Linux than on Windows (same PC, same AP)
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 22/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- c, linux
- Domain
- networking
Research direction
The report concerns the mt7921e driver for the MT7902 card, but the payload names no source file or test. Start from the dmesg lines and the ASPM and power-save settings the reporter already tried, then look at how the mt7921e PCIe path handles this revision. Done would mean identifying the cause of the throughput gap, with a verified fix or a clear diagnosis, and reproducing it against the iperf3 numbers in the table.
Written by the indexing model from the issue text.
Description
Hardware
- Card:
09:00.0 Network controller [0280]: MEDIATEK Corp. MT7902 802.11ax PCIe Wireless Network Adapter [Filogic 310] [14c3:7902] - Onboard on ASUS TUF GAMING B650M-E WIFI
- dmesg:
mt7921e 0000:09:00.0: ASIC revision: 79020000
mt7921e 0000:09:00.0: HW/SW Version: 0x8a108a10, Build Time: 20251212032046a
mt7921e 0000:09:00.0: WM Firmware Version: ____000000, Build Time: 20251212032127
- AP: AVM FRITZ!Box 5530 Fiber, 5 GHz, channel 36, 80 MHz, WiFi 6
Software
- Arch Linux, kernel
7.2.14-arch1-1 - linux-firmware-mediatek
20261019-1(distro firmware, no out-of-tree driver)
Problem
Throughput is 3-4x lower on Linux than on Windows 11 on the same machine, same AP, same position, same iperf3 server (wired, directly connected to the router).
| Direction | Linux | Windows 11 |
|---|---|---|
| PC -> server | ~47 Mbit/s | ~215 Mbit/s |
server -> PC (-R) |
~46 Mbit/s | ~151 Mbit/s |
Link looks fine on Linux:
signal: -64 dBm
rx bitrate: 324.2 MBit/s 80MHz HE-MCS 6 HE-NSS 1 HE-GI 0 HE-DCM 0
tx bitrate: 480.3 MBit/s 80MHz HE-MCS 9 HE-NSS 1 HE-GI 0 HE-DCM 0
Already tried (no improvement)
- Regulatory domain set to DE (was
00before) - Power save off (
iw dev wlp9s0 get power_save-> off, NetworkManagerwifi.powersave = 2) options mt7921e disable_aspm=1(dmesg confirms "disabling ASPM L1")- Bluetooth blocked via rfkill: no change
Happy to provide more logs or test patches.
- Dominant language
- C
- Stars
- 895
- Forks
- 461
- PR merge metrics
- No merged PRs in 30d
Getting set up
This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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