[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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
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

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


# 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

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.