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Old 09-23-2010, 06:00 PM
Guillaume Seigneuret
 
Default Bug#597865: Xen domU randomly loose network

Package: linux-image-2.6.32-5-xen-amd64
Version: 2.6.32-23

domU's randomly loose network, not at the same time. The only solution for the network to comes back is to reboot the virtual machine.Distrib version : Debian squeeze# dpkg -l | grep xen
ii libxenstore3.0 3.4.3~rc3-1 Xenstore communications library for Xen
ii linux-image-2.6.32-5-xen-amd64 2.6.32-23 Linux 2.6.32 for 64-bit PCs, Xen dom0 suppor
ii xen-hypervisor-4.0-amd64 4.0.1~rc5-1 The Xen Hypervisor on AMD64
ii xen-linux-system-2.6.32-5-xen-amd64 2.6.32-23 Xen system with Linux 2.6.32 on 64-bit PCs (
ii xen-qemu-dm-4.0 4.0.0-5 Xen Qemu Device Model virtual machine hardwa
ii xen-utils-4.0 4.0.1~rc5-1 XEN administrative tools
ii xen-utils-common 4.0.0-1 XEN administrative tools - common files
ii xenstore-utils 4.0.1-1 Xenstore utilities for Xen# dpkg -l | grep udev
ii libudev0 160-1 libudev shared library
ii udev 160-1 /dev/ and hotplug management daemonA fixed memory amount has been applied to the dom0 (dom0_mem=768M lowmem_emergency_pool=16M)The offload checksum has been disabled on each domU and dom0. (post-up ethtool -K eth0 tx off)
DomU's are using the same kernel/modules as dom0.The bug has been reproduced on two servers.Cordialement,
Guillaume Seigneuret*




Network and System Security Architect


Web*: * * * * *http://www.omegacube.fr


Address*:Hôtel Technologique - BP 100


Technopôle de Château Gombert

13382 Marseille Cedex 13
 
Old 09-23-2010, 06:41 PM
Ian Campbell
 
Default Bug#597865: Xen domU randomly loose network

There's a very high chance this is the same issue as described in
#596635. I'm just about to add a patch for this to SVN (which will
become 2.6.32-24).

On Thu, 2010-09-23 at 20:00 +0200, Guillaume Seigneuret wrote:
> Package: linux-image-2.6.32-5-xen-amd64
> Version: 2.6.32-23
>
> domU's randomly loose network, not at the same time. The only solution for the network to comes back is to reboot the virtual machine.
> Distrib version : Debian squeeze
> # dpkg -l | grep xen
> ii libxenstore3.0 3.4.3~rc3-1 Xenstore communications library for Xen
> ii linux-image-2.6.32-5-xen-amd64 2.6.32-23 Linux 2.6.32 for 64-bit PCs, Xen dom0 suppor
> ii xen-hypervisor-4.0-amd64 4.0.1~rc5-1 The Xen Hypervisor on AMD64
> ii xen-linux-system-2.6.32-5-xen-amd64 2.6.32-23 Xen system with Linux 2.6.32 on 64-bit PCs (
> ii xen-qemu-dm-4.0 4.0.0-5 Xen Qemu Device Model virtual machine hardwa
> ii xen-utils-4.0 4.0.1~rc5-1 XEN administrative tools
> ii xen-utils-common 4.0.0-1 XEN administrative tools - common files
> ii xenstore-utils 4.0.1-1 Xenstore utilities for Xen
> # dpkg -l | grep udev
> ii libudev0 160-1 libudev shared library
> ii udev 160-1 /dev/ and hotplug management daemon
> A fixed memory amount has been applied to the dom0 (dom0_mem=768M lowmem_emergency_pool=16M)
> The offload checksum has been disabled on each domU and dom0. (post-up ethtool -K eth0 tx off)
> DomU's are using the same kernel/modules as dom0.
> The bug has been reproduced on two servers.
> Cordialement,
> Guillaume Seigneuret
>
>
>
>
>
> Network and System Security Architect
> Web : http://www.omegacube.fr
> Address :
> Hôtel Technologique - BP 100
> Technopôle de Château Gombert
> 13382 Marseille Cedex 13
>

--
Ian Campbell

BOFH excuse #22:

monitor resolution too high
 
Old 09-23-2010, 07:00 PM
Guillaume Seigneuret
 
Default Bug#597865: Xen domU randomly loose network

Is there any explanation to this issue ???*I can't get no error log of this weird behavior and it's driving me mad !
Cordialement,

Guillaume Seigneuret*




Network and System Security Architect


Web*: * * * * *http://www.omegacube.fr


Address*:Hôtel Technologique - BP 100


Technopôle de Château Gombert

13382 Marseille Cedex 13



2010/9/23 Ian Campbell <ijc@hellion.org.uk>

There's a very high chance this is the same issue as described in

#596635. I'm just about to add a patch for this to SVN (which will

become 2.6.32-24).



On Thu, 2010-09-23 at 20:00 +0200, Guillaume Seigneuret wrote:

> Package: linux-image-2.6.32-5-xen-amd64

> * Version: 2.6.32-23

>

> domU's randomly loose network, not at the same time. The only solution for the network to comes back is to reboot the virtual machine.

> Distrib version : Debian squeeze

> # dpkg -l | grep xen

> ii *libxenstore3.0 * * * * * * * * * * *3.4.3~rc3-1 * * * * * * *Xenstore communications library for Xen

> ii *linux-image-2.6.32-5-xen-amd64 * * *2.6.32-23 * * * * * * * *Linux 2.6.32 for 64-bit PCs, Xen dom0 suppor

> ii *xen-hypervisor-4.0-amd64 * * * * * *4.0.1~rc5-1 * * * * * * *The Xen Hypervisor on AMD64

> ii *xen-linux-system-2.6.32-5-xen-amd64 2.6.32-23 * * * * * * * *Xen system with Linux 2.6.32 on 64-bit PCs (

> ii *xen-qemu-dm-4.0 * * * * * * * * * * 4.0.0-5 * * * * * * * * *Xen Qemu Device Model virtual machine hardwa

> ii *xen-utils-4.0 * * * * * * * * * * * 4.0.1~rc5-1 * * * * * * *XEN administrative tools

> ii *xen-utils-common * * * * * * * * * *4.0.0-1 * * * * * * * * *XEN administrative tools - common files

> ii *xenstore-utils * * * * * * * * * * *4.0.1-1 * * * * * * * * *Xenstore utilities for Xen

> # dpkg -l | grep udev

> ii *libudev0 * * * * * * * * * * * * * *160-1 * * * * * * * * * *libudev shared library

> ii *udev * * * * * * * * * * * * * * * *160-1 * * * * * * * * * */dev/ and hotplug management daemon

> A fixed memory amount has been applied to the dom0 (dom0_mem=768M lowmem_emergency_pool=16M)

> The offload checksum has been disabled on each domU and dom0. (post-up *ethtool -K eth0 tx off)

> DomU's are using the same kernel/modules as dom0.

> The bug has been reproduced on two servers.

> Cordialement,

> Guillaume Seigneuret

>

>

>

>

>

> Network and System Security Architect

> Web : * * * * *http://www.omegacube.fr

> Address :

> Hôtel Technologique - BP 100

> Technopôle de Château Gombert

> 13382 Marseille Cedex 13

>



--

Ian Campbell



BOFH excuse #22:



monitor resolution too high
 
Old 09-23-2010, 07:08 PM
Ian Campbell
 
Default Bug#597865: Xen domU randomly loose network

On Thu, 2010-09-23 at 21:00 +0200, Guillaume Seigneuret wrote:
> Is there any explanation to this issue ???
> I can't get no error log of this weird behavior and it's driving me
> mad !

Please see bug 596635 which this one is now merged with.

In a nutshell smartpoll mode is not reliable (causing random loss of
network connectivity) and is therefore now disabled in debian-kernel's
SVN.

There was a few threads regarding smartpoll's reliability on xen-devel
in the last month or so if you want to research further.

Ian.
--
Ian Campbell

Nothing makes one so vain as being told that one is a sinner.
Conscience makes egotists of us all.
-- Oscar Wilde
 

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