Zyxel GS1900-8 throughput low

Hi guys:

I use zyxel gs1900-8 (RTL8380M) as a bridge firewall with openwrt 22.03.2.
But when I copy file between vlan , the bandwidth maxmium about 20Mb/s.
I use top command and found cpu high .

    8     2 root     RW       0   0%  78% [ksoftirqd/0]
  865     2 root     IW       0   0%  14% [kworker/0:2-eve]

and kernel eth0 interrupts increase rapidly.

root@OpenWrt:/# cat /proc/interrupts
  7:     219582      MIPS   7  timer
 19:          0  realtek-rtl-intc  19  realtek-otto-wdt
 20:          8  realtek-rtl-intc  20  rtl838x-link-state
 24:    4469097  realtek-rtl-intc  24  eth0
 31:     158991  realtek-rtl-intc  31  ttyS0
ERR:          1

Is RTL8380M chip performance poor ?

This is a switch, not a firewall or router. So yes: the performance of the SoC is poor, as it is only meant for management/configuration purposes.

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