Performance of WCN7850

[Jeff Johnson]

On 2/27/2024 5:54 AM, Jun Nie wrote:
> Hi,
> 
> I am trying to maximize the bandwidth of WCN7850. Does anyone know the
> performance status of WCN7850 in mainline? It's about 160Mbps in 6GHz
> band and ~600Mbps in 5GHz band on sm8650 platform in my test. The
> firmware is from below links:
> https://github.com/kvalo/ath11k-firmware/raw/master/ath12k-testing/WCN7850/hw2.0/board.bin
> https://github.com/kvalo/ath11k-firmware/raw/master/ath12k-testing/WCN7850/hw2.0/regdb.bin
> 
> While it is ~940Mbps in both 5GHz and 6GHz band with
> Android/linux6.1.25, . But the firmware names are different per log,
> amss20.bin on Android. Not sure whether the driver is totally
> different for Android/linux6.1.25 and mainline.

The drivers are different. Android uses the out-of-tree qcacld-3.0 driver.

> Do you have any idea that the low performance on mainline is due to
> driver difference or TX/RX power configuration, or firmware version?

My expectation is that the upstream mac80211 datapath will never achieve
the same throughput as a custom datapath. That said, the ath12k driver
is still under very active development, and performance tuning will
occur in the future.

/jeff