Re: [Xen-users] Vif dropping packets

[Peter Booth <peter_booth@xxxxxx>]

Mike,

You don't say anything about the workload on your system or the  
resource consumption that it causes.
Do you have sar installed on the domUs? Does a one second vmstat show  
a %st that's above 1%?
Sent from my iPhone

On Jun 26, 2009, at 4:22 PM, Mike Lovell <mike@xxxxxxxxxxxx> wrote:

> 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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> Xen-users@xxxxxxxxxxxxxxxxxxx
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