[Xen-users] Vif dropping packets

[Mike Lovell <mike@xxxxxxxxxxxx>]

I have a problem with packets being dropped on some vif interfaces. I 
currently have a box running Debian Lenny with Xen 3.2.1. The host is 
running the Xen-ified kernel from the Debian repos. 2.6.26-1-xen-amd64. 
The host has a single bridge, 'vmnet', that connects to one physical 
interface and all of the guest's interfaces connect to. If I do a 
'ifconfig vifX.0', I see dropped TX packets. Looking at the guest does 
not show any dropped packets on its interface.
From the host
# cat /etc/network/interfaces
auto vmnet
iface vmnet inet static
       address 10.135.2.71
       netmask 255.255.255.224
       bridge_ports eth1
       bridge_stp off
       bridge_fd 9
       bridge_hello 2
       bridge_maxage 12


# brctl show vmnet
bridge name    bridge id        STP enabled    interfaces
vmnet               8000.003048c8166d    no        eth1
                       
                                                  vif22.0
                                                                          
... <lots of interfaces>
# ifconfig vif22.0
vif22.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff 
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
         UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
         RX packets:7946252 errors:0 dropped:0 overruns:0 frame:0
         TX packets:8282858 errors:0 dropped:160 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:5758663699 (5.3 GiB)  TX bytes:5887860418 (5.4 GiB)


From the guest
# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:16:3E:02:00:91 
         inet addr:10.135.2.91  Bcast:10.135.2.127  Mask:255.255.255.192
         inet6 addr: fe80::216:3eff:fe02:91/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:8283072 errors:0 dropped:0 overruns:0 frame:0
         TX packets:7946364 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:5887884877 (5.4 GiB)  TX bytes:5869927068 (5.4 GiB)

# cat /etc/network/interfaces

auto eth0
iface eth0 inet dhcp
  post-up ethtool -K eth0 tx off




I am a stumped on this and it is causing some problems for some of the 
applications that are being tested across the virtual machines. For 
example, one app on one vm needs to connect to a database, on another 
vm, but it can't and complains. Do any of you know what might be causing 
this or any ways to fix this? Thanks in advance.
mike


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