Re: [Xen-users] Slow networking problem in dom0

[Mike Wright <mike.wright@xxxxxxxxxxxxxx>]

On 04/29/2011 06:16 AM, Emil Christopher Melar wrote:
> Hi! I have a sandy bridge H67 machine running Intel  i7 2600k.
> I installed  build-linux-2.6-pvops_x86_64 (commit
> 75cc13f5aa29b4f3227d269ca165dfa8937c94fe).
> It is running fine on my Ubuntu 10.10 Maverick, besides one thing: The
> ethernet goes from 50 MB/sec to 500 k/sec over time!
>
> Now my ethernet is dead slow and I have to restart the eth0 resulting
> in breaking the domU networks.
> The NIC I use is an intel e1000, so it should be pretty stable. The
> slowdown is both domU<-->  dom0, and dom0<-->  external network.
>
> I am getting really desperate since this is sort of in production. :)
> Thanks for any help!
>
> Some info:
> Kernel Linux 2.6.32.27 x86_64 PVOPS
>
> $ ethtool -i eth0
>
> driver: e1000
> version: 7.3.21-k5-NAPI
> firmware-version: N/A
> bus-info: 0000:08:00.0
>
> Settings for eth0:
>          Supported ports: [ TP ]
>          Supported link modes:   10baseT/Half 10baseT/Full
>                                  100baseT/Half 100baseT/Full
>                                  1000baseT/Full
>          Supports auto-negotiation: Yes
>          Advertised link modes:  10baseT/Half 10baseT/Full
>                                  100baseT/Half 100baseT/Full
>                                  1000baseT/Full
>          Advertised pause frame use: No
>          Advertised auto-negotiation: Yes
>          Speed: 1000Mb/s
>          Duplex: Full
>          Port: Twisted Pair
>          PHYAD: 0
>          Transceiver: internal
>          Auto-negotiation: on
>          MDI-X: Unknown
>          Supports Wake-on: umbg
>          Wake-on: g
>          Current message level: 0x00000007 (7)
>          Link detected: yes
>
> Offload parameters for eth0:
> rx-checksumming: on
> tx-checksumming: on
This may be the problem.  Try "ethtool -K eth0 tx off"

> scatter-gather: on
> tcp-segmentation-offload: on
> udp-fragmentation-offload: off
> generic-segmentation-offload: on
> generic-receive-offload: off
> large-receive-offload: off
> ntuple-filters: off
> receive-hashing: off
>
> /etc/network/interfaces:
>
>
> # This file describes the network interfaces available on your system
> # and how to activate them. For more information, see interfaces(5).
>
> # The loopback network interface
> auto lo
> iface lo inet loopback
>
> auto xen-pub
> iface xen-pub inet static
>        address 192.168.0.3
>        netmask 255.255.255.0
>        broadcast 192.168.0.255
>        gateway 192.168.0.1
>        bridge_ports eth0
>        bridge_maxwait 1
>        bridge_stp no
> auto xen-dmz
> iface xen-dmz inet manual
>        pre-up  brctl addbr xen-dmz ; ifconfig xen-dmz up
>        post-down ifconfig xen-dmz down ; brctl delbr xen-dmz
> auto xen-intern
> iface xen-intern inet manual
>        pre-up  brctl addbr xen-intern ; ifconfig xen-intern up
>        post-down ifconfig xen-intern down ; brctl delbr xen-intern

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