Re: Big network problem on recent kernel update fromxen/stable2.6.32.x

[Michal Novotny <minovotn@redhat.com>]

On 06/07/2010 05:04 PM, Pasi Kärkkäinen wrote:
> On Mon, Jun 07, 2010 at 09:53:09AM -0400, djmagee@mageenet.net wrote:
>    
>> I discovered the same issue, with PV drivers only.  On Xen 3.4.3 and
>> 4.0.0, I experienced the same problems.  Using one fully HVM linux domu,
>> and fully PV linux domu, and one windows domu with gplpv drivers, I
>> tested a 2.6.32.13 build from two weeks ago, and a 2.6.32.15 build from
>> Saturday with the same config.  PV network does not work properly with
>> 2.6.32.15, but qemu emulated device in the HVM domain without PV drivers
>> works fine.  All three work just fine with 2.6.32.13.  Symptom is that
>> packets never seem to get back to the domu.  For example, I have VMs on
>> 192.168.2.0/24 subnet, and dom0 routes traffic to local physical net on
>> 192.168.1.0/24.  If I ping 192.168.1.1 from a domu with PV drivers, I
>> can see the echo request and reply in tcpdump on the bridge device on
>> dom0, but domu does not seem to see the reply.  In some other cases,
>> domu sees the reply, but reports 999-1001ms response times, which I know
>> are inaccurate by watching tcpdump output.  Traffic other than ICMP is
>> completely unreliable; the packets that do get through have incredibly
>> high latency.  I'm 100% sure I don't have iptables or other network
>> config problems.
>>
>>      
> What bridge are you using? Is it virbr0, or some bridge with a physical NIC attached to it?
>
> -- Pasi
>
>    

The bridge is one automatically created using the xen daemon but the 
configuration broke now when I rebooted so I need to make it working 
first since now even `xm list` is not working and the xend.log is 
completely empty :(

Michal
>> -----Original Message-----
>> From: xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Fantu
>> Sent: Monday, June 07, 2010 9:20 AM
>> To: xen-devel@lists.xensource.com
>> Subject: [Xen-devel] Big network problem on recent kernel update
>> fromxen/stable2.6.32.x
>>
>>
>> I see only today how with last build of kernel do from last commit
>> (27ed1b0e0dae5f1d5da5c76451bc84cb529128bd) do network of windows xp domU
>> with gplpv 0.11.0.213 unusable, ping lost or over 1 second unable to
>> connect
>> with rdp to domU, unable to use network from domU and viceversa
>> Also with build with 2.6.32.14 (from commit
>> e8734951b7a8d838050277696541a7e57183bdce) have problem
>> but my last build with 2.6.32.13 not have network problem, I can not
>> remember committing but i have build on 26 may if just remember
>> All these build have same config:
>> http://old.nabble.com/file/p28805128/config-2.6.32.15 config
>> -- 
>> View this message in context:
>> http://old.nabble.com/Big-network-problem-on-recent-kernel-update-from-x
>> en-stable2.6.32.x-tp28805128p28805128.html
>> Sent from the Xen - Dev mailing list archive at Nabble.com.
>>
>>
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>>      
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-- 
Michal Novotny<minovotn@redhat.com>, RHCE
Virtualization Team (xen userspace), Red Hat