I have a CentOS 5.4 distro running Xen on top of a Linux bridge (set up by Xen). I have noticed by using iPerf in bidirectional mode that the traffic going into the server running the bridge is quite a bit slower with the bridge enabled than when it isn’t. The HW is a multiblade setup (8 blades each running CentOS 5.x). On one of the blades, I shut down Xen and initially run with the bridge shut down and transferred a file from another machine using scp. I then started up the bridge and transferred the same file and you can see below there is a big difference (3.6MB/s vs 23.2KB/s). I stopped Xen before doing the following...
Any help on where to look would be helpful. I was going to shut down all but one blade to see if it could be a lack of STP causing issues.
-- Xen bridge initially shut down
[root@bsbchp003 ~]# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 yes
-- transfer the 3.7GB file
[root@bsbchp003 ~]# scp card@harvard:bigfile .
bigfile 100% 3685KB 3.6MB/s 00:00
-- start the bridge
[root@bsbchp003 ~]# /etc/xen/scripts/network-bridge start
net.bridge.bridge-nf-call-arptables = 0
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
Nothing to flush.
Nothing to flush.
Waiting for peth0 to negotiate link..[root@bsbchp003 ~]#
-- the Xen bridge is now up
[root@bsbchp003 ~]# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 yes
xenbr0 8000.feffffffffff no peth0
vif0.0
[root@bsbchp003 ~]# scp card@harvard:bigfile .
bigfile 100% 3685KB 23.2KB/s 02:39
[root@bsbchp003 ~]#
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