Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> wrote:
> RTL8822CU, RTL8822BU, and RTL8821CU don't need BIT_EN_PRE_CALC.
> In fact, RTL8822BU in USB 3 mode doesn't pass all the frames to the
> driver, resulting in much lower download speed than normal:
>
> $ iperf3 -c 192.168.0.1 -R
> Connecting to host 192.168.0.1, port 5201
> Reverse mode, remote host 192.168.0.1 is sending
> [ 5] local 192.168.0.50 port 43062 connected to 192.168.0.1 port 5201
> [ ID] Interval Transfer Bitrate
> [ 5] 0.00-1.00 sec 26.9 MBytes 225 Mbits/sec
> [ 5] 1.00-2.00 sec 7.50 MBytes 62.9 Mbits/sec
> [ 5] 2.00-3.00 sec 8.50 MBytes 71.3 Mbits/sec
> [ 5] 3.00-4.00 sec 8.38 MBytes 70.3 Mbits/sec
> [ 5] 4.00-5.00 sec 7.75 MBytes 65.0 Mbits/sec
> [ 5] 5.00-6.00 sec 8.00 MBytes 67.1 Mbits/sec
> [ 5] 6.00-7.00 sec 8.00 MBytes 67.1 Mbits/sec
> [ 5] 7.00-8.00 sec 7.75 MBytes 65.0 Mbits/sec
> [ 5] 8.00-9.00 sec 7.88 MBytes 66.1 Mbits/sec
> [ 5] 9.00-10.00 sec 7.88 MBytes 66.1 Mbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> [ ID] Interval Transfer Bitrate Retr
> [ 5] 0.00-10.02 sec 102 MBytes 85.1 Mbits/sec 224 sender
> [ 5] 0.00-10.00 sec 98.6 MBytes 82.7 Mbits/sec receiver
>
> Don't set BIT_EN_PRE_CALC. Then the speed is much better:
>
> % iperf3 -c 192.168.0.1 -R
> Connecting to host 192.168.0.1, port 5201
> Reverse mode, remote host 192.168.0.1 is sending
> [ 5] local 192.168.0.50 port 39000 connected to 192.168.0.1 port 5201
> [ ID] Interval Transfer Bitrate
> [ 5] 0.00-1.00 sec 52.8 MBytes 442 Mbits/sec
> [ 5] 1.00-2.00 sec 71.9 MBytes 603 Mbits/sec
> [ 5] 2.00-3.00 sec 74.8 MBytes 627 Mbits/sec
> [ 5] 3.00-4.00 sec 75.9 MBytes 636 Mbits/sec
> [ 5] 4.00-5.00 sec 76.0 MBytes 638 Mbits/sec
> [ 5] 5.00-6.00 sec 74.1 MBytes 622 Mbits/sec
> [ 5] 6.00-7.00 sec 74.0 MBytes 621 Mbits/sec
> [ 5] 7.00-8.00 sec 76.0 MBytes 638 Mbits/sec
> [ 5] 8.00-9.00 sec 74.4 MBytes 624 Mbits/sec
> [ 5] 9.00-10.00 sec 63.9 MBytes 536 Mbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> [ ID] Interval Transfer Bitrate Retr
> [ 5] 0.00-10.00 sec 717 MBytes 601 Mbits/sec 24 sender
> [ 5] 0.00-10.00 sec 714 MBytes 599 Mbits/sec receiver
>
> Fixes: 002a5db9a52a ("wifi: rtw88: Enable USB RX aggregation for 8822c/8822b/8821c")
> Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
> Acked-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Patch applied to wireless.git, thanks.
4aefde403da7 wifi: rtw88: Fix the RX aggregation in USB 3 mode
--
https://patchwork.kernel.org/project/linux-wireless/patch/afb94a82-3d18-459e-97fc-1a217608cdf0@xxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
