Hi,
we're running 4 xen servers on our network with multiple network cards.
During HighLoad we experince degeneration of inbound network traffic
through our loadbalancer. I might found a reason for it, in Dom0 dmesg
output looks as follows:
[1157421.975910] eth0: received packet with own address as source address
[1157421.975957] eth0: received packet with own address as source address
[1196172.762318] eth0: received packet with own address as source address
[1196172.762370] eth0: received packet with own address as source address
[1196172.762403] eth0: received packet with own address as source address
[1196172.762436] eth0: received packet with own address as source address
[1196265.876029] eth0: received packet with own address as source address
[1196265.876078] eth0: received packet with own address as source address
[1196265.876111] eth0: received packet with own address as source address
[1196265.876144] eth0: received packet with own address as source address
I did a search on google and found:
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=339 but I also
found a side that suggests to turn off arp entirely for your xenbr0.
Enclosed is my network configuration and the output for my bridges. As
you see I'm not reseting my Mac address of the physical interface to
FE:FF:FF:FF:FF:FF or turn arp off. I'm using Debian Lenny with kernl
2.6.26-2-xen-amd64
===================================
# The loopback network interface
auto lo eth0 eth1 eth2 eth3
iface lo inet loopback
# xenbr0 -> eth0
auto xenbr0
iface xenbr0 inet static
address 192.168.0.78
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.2
dns-nameservers 192.168.0.88
bridge_ports eth0
bridge_stp no
bridge_fd 2
# xenbr1 -> eth1
auto xenbr1
iface xenbr1 inet manual
bridge_ports eth1
bridge_stp no
bridge_fd 2
# xenbr1 -> eth1
auto xenbr2
iface xenbr2 inet manual
bridge_ports eth2
bridge_stp no
bridge_fd 2
# xenbr1 -> eth1
auto xenbr3
iface xenbr3 inet manual
bridge_ports eth3
bridge_stp no
bridge_fd 2
===================================
brctl show
bridge name bridge id STP enabled interfaces
xenbr0 8000.001ec9edee86 no eth0
vif11.0
xenbr1 8000.001ec9edee88 no eth1
vif7.0
xenbr2 8000.001517853a12 no eth2
vif2.0
vif5.0
xenbr3 8000.001517853a13 no eth3
vif4.0
===================================
ifconfig
eth0 Link encap:Ethernet HWaddr
00:1e:c9:ed:ee:86
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX packets:353936209 errors:0 dropped:0 overruns:0
frame:0
TX packets:539964989 errors:0 dropped:0 overruns:0
carrier:0
collisions:0
txqueuelen:1000
RX bytes:90307422234 (84.1 GiB) TX bytes:158414382227 (147.5
GiB)
Interrupt:16
Memory:f8000000-f8012100
eth1 Link encap:Ethernet HWaddr 00:1e:c9:ed:ee:88
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1947394344 errors:0 dropped:0 overruns:0 frame:0
TX packets:1948580678 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:548745607526 (511.0 GiB) TX bytes:383546238463
(357.2 GiB)
Interrupt:16
Memory:f4000000-f4012100
eth2 Link encap:Ethernet HWaddr 00:15:17:85:3a:12
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:301633931 errors:0 dropped:0 overruns:0 frame:0
TX packets:326616376 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:84510247135 (78.7 GiB) TX bytes:160902850142 (149.8 GiB)
Memory:fc3e0000-fc400000
eth3 Link encap:Ethernet HWaddr 00:15:17:85:3a:13
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4529239537 errors:0 dropped:129 overruns:0 frame:0
TX packets:2456186725 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:557730056841 (519.4 GiB) TX bytes:329185143233
(306.5 GiB)
Memory:fc3a0000-fc3c0000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:120605 errors:0 dropped:0 overruns:0 frame:0
TX packets:120605 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:66133052 (63.0 MiB) TX bytes:66133052 (63.0 MiB)
vif11.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:315792060 errors:0 dropped:0 overruns:0 frame:0
TX packets:200025486 errors:0 dropped:120 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:77164903933 (71.8 GiB) TX bytes:46200681260 (43.0 GiB)
vif2.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:348647001 errors:0 dropped:0 overruns:0 frame:0
TX packets:298756316 errors:0 dropped:371 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:194069348655 (180.7 GiB) TX bytes:82457846658 (76.7 GiB)
vif4.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:2456187623 errors:0 dropped:0 overruns:0 frame:0
TX packets:4527772736 errors:0 dropped:25 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:294801705523 (274.5 GiB) TX bytes:557135764150
(518.8 GiB)
vif5.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:18948974 errors:0 dropped:0 overruns:0 frame:0
TX packets:49501981 errors:0 dropped:69 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:11853699794 (11.0 GiB) TX bytes:52336188222 (48.7 GiB)
vif7.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:1373054461 errors:0 dropped:0 overruns:0 frame:0
TX packets:1518581595 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:202298372493 (188.4 GiB) TX bytes:430015450340
(400.4 GiB)
xenbr0 Link encap:Ethernet HWaddr 00:1e:c9:ed:ee:86
inet addr:192.168.0.78 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:22766594 errors:0 dropped:0 overruns:0 frame:0
TX packets:22917123 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9752886671 (9.0 GiB) TX bytes:17044210276 (15.8 GiB)
xenbr1 Link encap:Ethernet HWaddr 00:1e:c9:ed:ee:88
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2042397 errors:0 dropped:0 overruns:0 frame:0
TX packets:2306 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:97427437 (92.9 MiB) TX bytes:96852 (94.5 KiB)
xenbr2 Link encap:Ethernet HWaddr 00:15:17:85:3a:12
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3009732 errors:0 dropped:0 overruns:0 frame:0
TX packets:2311 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:185132615 (176.5 MiB) TX bytes:97062 (94.7 KiB)
xenbr3 Link encap:Ethernet HWaddr 00:15:17:85:3a:13
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3414734 errors:0 dropped:0 overruns:0 frame:0
TX packets:2397 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240016669 (228.8 MiB) TX bytes:100674 (98.3 KiB)
===================================
thanks for you're help.
Regards,
Alex
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