I made some tests with HTB, and i usually set MTU to the default value of TCP_WMEM (that is 65536 for me).
I have this case :
50 Mbits/s 10 Mbits/s
A----------------------------------B---------------------------------------C
if A send to B, bandwidth is about 50 Mbits/s
if B send to C, bandwidth is about 10 Mbits/s
But if A send to C, Bandwidth is about 14 Mbits/s, instead of 10 Mbits/s.
I think perhaps the MTU should be different according to bandwidth ?
Has someone an idea about this ?
Here is my configuration :
On A :
tc class add dev eth0 parent 1: classid 1:2 htb rate 50000kbit ceil 50000kbit mtu 65536
tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip dst B flowid 1:2
On B :
tc class add dev eth0 parent 1: classid 1:2 htb rate 10000kbit ceil 10000kbit mtu 65536
tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip dst C flowid 1:2
On B, /proc/sys/net/ipv4/ip_forward =1, and there is no link between A and C.
Thanks,
Olivier.
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