[Xen-users] Re: [Xen-devel] Re: Using Xen Virtualization Environment for Development and Testing of Supercomputing and High Performance Computing (HPC) Cluster MPICH2 MPI-2 Applications

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Oct 30, 2009 at 04:35:00PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    Dear All,
> 
>    I have solved the problem.
> 
>    With reference to
>    [1]http://lists.xensource.com/archives/html/xen-devel/2009-05/msg01327.html
>    and
>    
> [2]http://hightechsorcery.com/2008/03/virtualization-tip-always-disable-checksumming-virtual-ethernet-devices
>    , I have executed the following command as root on all my 6 compute nodes
>    (each compute node is a F11 linux 64-bit PV virtual machine).
> 
>    # ethtool -K eth0 tx off gso on
>

Jeremy: Do you know why this is still needed nowadays? 

Where's the bug? Why doesn't it work with the defaults? 

-- Pasi


<snip>

>    On Fri, Oct 30, 2009 at 4:12 PM, Mr. Teo En Ming (Zhang Enming)
>    <[7]space.time.universe@xxxxxxxxx> wrote:
> 
>      Dear All,
> 
>      I have googled something which may help to solve my problem.
> 
> [Xen-devel] Network drop on domU (netfront: rx->offset: 0, size: 4294967295)
> 
>      
> [8]http://lists.xensource.com/archives/html/xen-devel/2009-05/msg01274.html
> 
>   Virtualization Tip: Always disable checksumming on virtual ethernet devices
> 
>      
> [9]http://hightechsorcery.com/2008/03/virtualization-tip-always-disable-checksumming-virtual-ethernet-devices
> 
>      Let me try to work on it first.
> 

<snip>

>        On Fri, Oct 30, 2009 at 2:53 PM, Mr. Teo En Ming (Zhang Enming)
>        <[19]space.time.universe@xxxxxxxxx> wrote:
> 
>          Dear All,
> 
>          Here are more virtual network interface eth0 kernel messages. Notice
>          the "net eth0: rx->offset: 0" messages. Are they of significance?
> 
>          Node 1
> 
>          Oct 30 22:40:34 enming-f11-pv-hpc-node0001 mountd[1304]:
>          authenticated mount request from [20]192.168.1.253:1009 for
>          /home/enming/mpich2-install/bin (/home/enming/mpich2-install/bin)
>          Oct 30 22:40:56 enming-f11-pv-hpc-node0001 mountd[1304]:
>          authenticated mount request from [21]192.168.1.252:877 for
>          /home/enming/mpich2-install/bin (/home/enming/mpich2-install/bin)
>          Oct 30 22:41:19 enming-f11-pv-hpc-node0001 mountd[1304]:
>          authenticated mount request from [22]192.168.1.251:1000 for
>          /home/enming/mpich2-install/bin (/home/enming/mpich2-install/bin)
>          Oct 30 22:41:41 enming-f11-pv-hpc-node0001 mountd[1304]:
>          authenticated mount request from [23]192.168.1.250:882 for
>          /home/enming/mpich2-install/bin (/home/enming/mpich2-install/bin)
>          Oct 30 22:42:04 enming-f11-pv-hpc-node0001 mountd[1304]:
>          authenticated mount request from [24]192.168.1.249:953 for
>          /home/enming/mpich2-install/bin (/home/enming/mpich2-install/bin)
>          Oct 30 22:42:34 enming-f11-pv-hpc-node0001 mpd: mpd starting; no
>          mpdid yet
>          Oct 30 22:42:34 enming-f11-pv-hpc-node0001 mpd: mpd has
>          mpdid=enming-f11-pv-hpc-node0001_48545 (port=48545)
>          Oct 30 22:42:37 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:37 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:37 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:38 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:38 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:38 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:39 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:39 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:39 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:40 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: __ratelimit: 12
>          callbacks suppressed
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:46 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:47 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:47 enming-f11-pv-hpc-node0001 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
> 
>          Node 6
> 
>          Oct 30 22:42:44 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:44 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:44 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:44 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:42:48 enming-f11-pv-hpc-node0006 mpd: mpd starting; no
>          mpdid yet
>          Oct 30 22:42:48 enming-f11-pv-hpc-node0006 mpd: mpd has
>          mpdid=enming-f11-pv-hpc-node0006_52805 (port=52805)
>          Oct 30 22:46:00 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:46:00 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
>          Oct 30 22:46:00 enming-f11-pv-hpc-node0006 kernel: net eth0:
>          rx->offset: 0, size: 4294967295
> 
>          Node 1 NFS Server Configuration
> 
>          [root@enming-f11-pv-hpc-node0001 ~]# cat /etc/exports
>          /home/enming/mpich2-install/bin        [25]192.168.1.0/24(ro)
> 
>          Node 2 /etc/fstab Configuration Entry for NFS Client
> 
>          192.168.1.254:/home/enming/mpich2-install/bin
>          /home/enming/mpich2-install/bin    nfs
>          rsize=8192,wsize=8192,timeo=14,intr
> 


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