houshoul - Linux bridge have very high packet delay variation and latency?
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http://unix.stackexchange.com/questions/175212/packets-switched-through-linux-bridge-have-very-high-packet-delay-variation-and
I configured a very simple bridge under Debian Wheezy(kernel 3.2.0-4-686-pae). I simply created bridge interface withbrctl addbr br0
and added interfaces eth1
and eth2
into this bridge withbrctl addif br0 eth1
and brctl addif br0 eth2
commands. STP is disabled. However, the latency of frames switched is very high and fluctuating. For example RTT shown inping
output fluctuates from 30 to 1100ms if I ping a router in the very same broadcast domain. Usually it is below 1ms. However, there seems to be no packet loss. CPU load on this Linux bridge is very low. According toip -s link show dev eth1
and ip -s link show dev eth2
there are no errors or drops. Botheth0
and eth1
are Realtek PCI NIC's using the 8139too LKM. What might cause such behavior? Some sort of faulty queuing?
EDIT: one of the Realtek interfaces was problematic. I formed a bridge with new NIC.
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