Bandwidth limit changed to byte

[huiyouyongdemao]

What would you like to be added:
It is hoped that the bandwidth limit calculation unit can be changed to byte, which is currently the bandwidth limit calculation unit Mbps.
byte changed to Mbps
Why is this needed:
Better control

[davies]

For network bandwidth, we usually use Gbps or Mbps, not bytes.

[davies]

@huiyouyongdemao could you say more on why this change is better to user?