William Xu wrote:
Hi,
I have a server and ten clients in a Gigabit network. The server has
125mbps network bandwidth.
I want that the server has 40Mbps bandwidth reserved for client 1 (IP
192.168.5.141), and the
rest bandwidth is for all other clients.
<snip>
I ran a test in which all 10 clients send/receive packets to/from the
server simultaneously. But
Client 1 only got 20mbps bandwidth for sending, and 38mpbs for
receiving. If I limit the rate of
both classes 1:1 to 60mbps instead of 125mbps, Client 1 got 39mbps for
sending, and 40mbps for
receiving.
I am not sure what might cause this. Is it because TC doesn't work well
when network is congested?
Or my script is not right?
No network will be able to operate at its theoretical maximum. In the
case of a gigabit network you will be lucky to get consistent 120mbps,
and it heavily depends on the hardware quality, and the number of
switches in between. So what you are doing is oversaturating the link,
the ACK packets can not get through, your speed drops due to
delays/retransmissions. Perform a test with only two systems sending
stuff to each other to see what is the actual bandwidth you can hope
for, and use that number instead of 125mbps.
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