On 11/28/2023 6:04 PM, Baochen Qiang wrote: > For WCN7850, there is a SRNG named MAC buffer ring, i.e., > dp->rx_mac_buf_ring. During initialization, it is setup > by host and then under control of firmware. During RX > process, firmware fetches buffers from > dp->rx_refill_buf_ring to fill that MAC buffer ring, > and those buffers are taken by RXDMA to carry real WLAN > frames received from air. > > Currently a low RX throughput is observed. Checking > firmware log, lots of errors are reported by MAC buffer > ring, complaining that it is running out of buffers, > which further indicates that RXDMA is suffering from > starvation. Currently the size of dp->rx_mac_buf_ring > is configured as 1024. After changing it to 2048, those > error messages are reduced, and a 6.4% increase is seen > in peak throughput. Note that 2048 is an empirical > value. It is chosen here because the RX throughput > meets our expectation after the change. > > This change only applies to WCN7850 since other > chips don't have a MAC buffer ring. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Signed-off-by: Baochen Qiang <quic_bqiang@xxxxxxxxxxx> Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx>
