[Bridge] Performance problem with linux bridge ... compare kernel to

Paweł Staszewski pstaszewski at artcom.pl
Sun Jan 29 14:48:23 PST 2006

With kernel linux bridge with traffic management for 4000users 
and 20.4 MB/s(tx)/22.4 MB/s(rx) data load of CPU is max 50%
With kernel the same linux bridge with the same traffic has 
100% CPU load and in top I have ksoftirqd proccess.

The machine is P4 3.2 GHz with 1GB of ram and 4 NetGear 620 cards

The config is:

/sbin/modprobe acenic link=0x0100,0x0100,0x0100,0x0100 
tx_coal_tick=256,256,256,256 rx_coal_tick=256,256,256,256 
max_rx_desc=512,512,512,512 max_tx_desc=512,512,512,512

/sbin/ifconfig eth0 txqueuelen 10000 mtu 1500 up
/sbin/ifconfig eth1 txqueuelen 10000 mtu 1500 up
/sbin/ifconfig eth2 txqueuelen 10000 mtu 1500 up
/sbin/ifconfig eth3 txqueuelen 10000 mtu 1500 up

#To bond0
/sbin/ifconfig eth0 down
/sbin/ifconfig eth2 down

#To bond1
/sbin/ifconfig eth1 down
/sbin/ifconfig eth3 down

modprobe bonding max_bonds=2

ifconfig bond0 up

ifenslave-2.6 bond0 eth0 eth2

ifconfig bond1 up

ifenslave-2.6 bond1 eth1 eth3

/usr/local/sbin/brctl addbr br999

/sbin/vconfig add bond0 999
/sbin/vconfig add bond1 999
/sbin/ifconfig bond0.999 up
/sbin/ifconfig bond1.999 up

/usr/local/sbin/brctl addif br999 bond0.999
/usr/local/sbin/brctl addif br999 bond1.999
/sbin/ifconfig br999 up

Host has 102 vlans (bridges)
On each vlan interface is traffic management (iproute2 with hashing filters)

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