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Old 11th November 2010, 11:23 AM
Bellsouth Offline
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Join Date: Nov 2010
Posts: 2
windows_7firefox
Fedora 14 and Hyper-V

Hi Community,

i'm running some virtual Fedora installations on a windows server 2008 with hyper-v. Most of them are Fedora 12 and 13. Everything works fine for some years.

Yesterday i want to upgrade a F13 machine to F14 by netistall. The upgrade ran without any problems. After the reebot the machine was off the network. All the networkconfigs by DHCP are OK, IP address, gateways, DNS settings and so on. But the machine can't ping or connect to other hosts. I tried an VM from scratch with both F14 i386 and x86_64 - same ****.

This is the first time i had such a problem by upgrading Fedora machines.

Any hints?

Regards

Lissy
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  #2  
Old 11th November 2010, 04:38 PM
vaneldik Offline
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Join Date: Mar 2010
Posts: 1
linuxredhatfirefox
Re: Fedora 14 and Hyper-V

Hi,

I have seen similar behaviour (with F12, F13, RHEL6), and found that this
problem is only present when:

* the machine has more than 1 vCPU, and
* the irqbalance service is running.

In fact, we observed that the network service was successfully started, but that after
~10 seconds the machine was losing its network connection. This helped us to find
out that irqbalance was implicated.

I would be interested to know if you can reproduce this.

cheers, jan
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  #3  
Old 12th November 2010, 03:48 AM
BassHorizon Offline
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Join Date: Nov 2010
Posts: 2
windows_7firefox
Re: Fedora 14 and Hyper-V

Hi,

I'm having the same problem since Fedora 14. DHCP works I get about 2-3k of data before it stops working.

I have an image for fedora 12 that works with irqbalance enabled.

Disabling irqbalance (chkconfig irqbalance off) seems to fix the problem.

I have noticed the following errors from dmesg

It says something like

---------[ cut here ]-------------
WARNING: at net/sched/sch_generic.c:258 dev_watchdog+0xc6/0x12e()
Hardware name: Virtual Machine
NETDEV WATCHDOG: eth0 (tulip): transmit queue 0 timed out
...
...
...
net eth0: 21140 transmit timed out, status fc67814, fffffe00
00000068 00000070 fffffec8, resetting...
net eth0: 21140 transmit timed out, status fc67814, fffffe00
00000068 00000070 fffffec8, resetting...
net eth0: 21140 transmit timed out, status fc67814, fffffe00
00000068 00000070 fffffec8, resetting...

Maybe something related to the Amazon cloud changes?
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  #4  
Old 12th November 2010, 11:46 AM
Bellsouth Offline
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Join Date: Nov 2010
Posts: 2
windows_7firefox
Re: Fedora 14 and Hyper-V

Hi!

The problem is solved! It was the irqbalance service which cuts off the machine. it doesn't matter if the VM had one or more CPU Kernels. It's the same on i386 and x86_64 systems.

Thanks for your help!

Regards

Lissy

Last edited by Bellsouth; 12th November 2010 at 04:54 PM.
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