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[Xen-users] Slow networking problem in dom0

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Emil Christopher Melar <typeof@xxxxxxxxx>
  • Date: Fri, 29 Apr 2011 12:16:57 +0200
  • Delivery-date: Fri, 29 Apr 2011 03:18:15 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi! I have a sandy bridge H67 machine running Intel  i7 2600k.
I installed  build-linux-2.6-pvops_x86_64 (commit
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 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
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/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
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


# 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
      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
Emil Christopher Solli Melar

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