Speed problem when using tc only in mt7986 with 2 2.5G wan/lan port

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi, guys! When I tested limiting speed using tc+ifb, the speed from 2.5G LAN to 2.5GWan was only 1Gbps, and hwnat has been turned off. Has anyone encountered this problem，Here is the command：
insmod ifb.ko

ip link add ifb0 type ifb
ip link set dev ifb0 up

tc qdisc add dev ifb0 root handle 1: htb
tc qdisc add dev br-lan root handle 1: htb

tc qdisc add dev br-lan handle ffff: ingress
tc filter add dev br-lan parent ffff: protocol ip u32 match u32 0 0 action connmark action mirred egress redirect dev ifb0

There is no filter set for speed limitation。When I deleted qdisc, it worked normally and exceeded 1G (unable to reach 2.5 because hwnat has been turned off)：
tc qdisc del dev br-lan handle ffff: ingress
tc qdisc del dev ifb0 root handle 1: htb
tc qdisc del dev br-lan root handle 1: htb

2

Try packet steerig or irqbalance (one at a time)

3

thanks, bro. After setting rps_cpus, there was a significant improvement in performance. I used to think it was a problem with restrictions on tc and ifb.