Re: [Xen-users] dom0 networking getting screwd at random periods

[Martins Lazdans <marrtins@xxxxxxxx>]

Does anyone have any hint where to dig? Right now I wrote a script that 
checks ping to gateway and in case of timeouts restarts bridge and 
reattaches domUs to it. Right now bridge is stopping working like every 
3 minutes. Can this be hardware related?
One guy replied to me directly having the same problem on CentOS (I 
guess it was CentOS).
Martins Lazdans wrote:
> Hello!
>
> I having a problem with dom0 (running Debian lenny, latest patches 
> applied) networking getting stopped after random periods of time - it's 
> been 18 hours and it's been 5 hours. dom0 got two NIC (peth0, peth1), 
> two subnets (a, b), configured two bridges (eth0, eth1 - each subnet 
> resides on different NIC). dom0 have each NIC configured with dedicated 
> IP form correspongin subnets. So, eth0 serves subnet a, while eth1 is 
> serving subnet b.
> In xend-config.sxp:
> (network-script network-bridge-wrapper) and network-bridge-wrapper is just:
>
> #!/bin/sh
> /etc/xen/scripts/network-bridge "$@" netdev=eth0
> /etc/xen/scripts/network-bridge "$@" netdev=eth1
>
> After random periods of time, eth0 goes down along with all domU 
> networking attached to it. I'm unnable to connect or ping dom0 neither 
> on peth0 nor peth1 nor any of domU attached to that bridge.
> However, domU using eth1 bridge are working just fine. I can SSH to domU 
> and then SSH to dom0 on peth1 IP address (remember, I could not do that 
> form "outside").
> After I do `/etc/xen/scripts/network-bridge stop` and then start, dom0 
> networking comes back. I just do `brctl addif eth0 vifX.0` to attach 
> domUs back and all works fine till next such event.
> Anyone had experienced such thing? I've been running this server for 
> some three years w/o problems. This problem started around 31 of may. 
> Maybe it has something to do with any of latest updates?
> There are no network spikes, no high load avg, nothing in logfiles, 
> nothing on xm dmesg, ne domU restarts. I've been searching Google for 
> some days now, and nothing comes up.
> Basicly, I've got the same issue as described here:
> http://lists.xensource.com/archives/html/xen-users/2008-03/msg00609.html
>
> Btw, I've got very similar issue twice with other sarver, differend 
> hardware, different data center, CentOS 5.6, Xen 3.4.2. However, that 
> server was using only one NIC so I'm not aware if this was excacly the 
> same problem. I ran into this problem twice, about two months ago. 
> However there is no errors since then which made me believe problem was 
> solved with some OS updates? Back then I thought it's beeing hardware 
> error as I had this server deployed only 3 months before incident.
> My config is below.
>
> Many thanks!
>
> # uname -a
> Linux doom 2.6.26-2-xen-amd64 #1 SMP Tue Jan 25 06:13:50 UTC 2011 x86_64 
> GNU/Linux
> # xm info
> host                   : doom
> version                : #1 SMP Tue Jan 25 06:13:50 UTC 2011
> machine                : x86_64
> nr_cpus                : 8
> nr_nodes               : 1
> cores_per_socket       : 4
> threads_per_core       : 1
> cpu_mhz                : 2200
> hw_caps                : 
> 178bf3ff:efd3fbff:00000000:00000110:00802001:00000000:000007ff
> total_memory           : 32767
> free_memory            : 2116
> node_to_cpu            : node0:0-7
> xen_major              : 3
> xen_minor              : 2
> xen_extra              : -1
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
> hvm-3.0-x86_32p hvm-3.0-x86_64
> xen_scheduler          : credit
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : unavailable
> cc_compiler            : gcc version 4.3.1 (Debian 4.3.1-2)
> cc_compile_by          : waldi
> cc_compile_domain      : debian.org
> cc_compile_date        : Sat Jun 28 09:32:18 UTC 2008
> xend_config_format     : 4
--
Martins Lazdans

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