Re: [Xen-users] DomU - network performance and possibilities (HVM, PVM, pci-passthru, stubdom, PV on HVM...)

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, May 18, 2010 at 05:42:15PM +0800, lei yang wrote:
>    On Thu, May 13, 2010 at 9:12 PM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote:
> 
>      Hello,
> 
>      Matej: I didn't get your initial post to xen-users because I got
>      (automatically) unsubscribed
>      from the list, due to my email provider getting blacklisted because of
>      some spam problems,
>      but now I subscribed again..
> 
>      To answer your questions:
> 
>      1) No, it's not possible to use VirtIO with Xen.
>      2) Yes, it's possible to use PV-on-HVM drivers in the guest with pvops
>      dom0.
> 
>      3) Take a look at:
>      [2]http://wiki.xensource.com/xenwiki/XenLinuxPVonHVMdrivers
> 
>      Did you already make some benchmarks? If you need good latency then I
>      think
>      PCI passthrough will help a lot there.. or Xen netchannel2.
> 
> 
> 
>      Which one will be better for thoughput,  pci passthrogh or netchanel2?
> 

pci passthrough.

-- Pasi

>      Thanks
>      Lei
> 
> 
> 
>      -- Pasi
> 
>      Original email from Matej:
> 
>      Hi,
> 
>      I want to (need to) do a network performance analysis/benchmark of
>      various Xen networking solutions (analyzing the pros and cons of network
>      infrastructure virtualisation) on top of Xen 4.0.
> 
>      So far I have Xen 4.0 running with various Dom0 kernels (git stable
>      2.6.32.11, git stable 2.6.31.13, mercurial 2.6.18.8, Debian distribution
>      2.6.26-2xen...want try some newer forward ported Xen kernel too).
> 
>      AFAIK, there are these possibilities for DomU "architecture".
> 
>      1. DomU as classic emulated HVM.
>      2. DomU as classic PVM (pv_ops kernel and Xen kernel)
>      3. DomU as classic emulated HVM with Xen PV drivers (don't know whether
>      these work with pv_ops Dom0, but for that case I have the 2.6.18.8 Xen
>      linux)
>      4. DomU as classic PVM with pass-thru PCI NICs
>      5. DomU as classic HVM with pass-thru PCI NICs (don't have IOMMU capable
>      HW :( )
>      6. DomU as HVM with stubdom (according to various papers, this should be
>      a bit faster than classic HVM DomU)
>      7. DomU as HVM with virtio drivers (is this possible in xen4.0?)
> 
>      I'm interested in the latency and bandwidth performance in phys-DomU and
>      DomU-DomU scenarios (I have own tool for network latency benchmarking
>      and for bandwidth there's the Iperf :) ). Also I will try to experiment
>      a bit with the CPU pinning and schedulers in these scenarios.
> 
>      Also would like to test and testbench OpenSwitch as linux-bridge
>      replacement (but I'm afraid I will not have time for this).
> 
>      So my questions are:
> 
>      1. Is possible to use VirtIO with XEN 4.0 (as another approach on the
>      PV-on-HVM)?
>      2. Is possible to use the Xen HVM DomU PV drivers (unmodified drivers?)
>      with pvops Dom0?
>      3. If you have some ideas or hints, I will be very thankful. :)
> 
>      Regards
> 
>      Matej
> 
>      _______________________________________________
>      Xen-users mailing list
>      [3]Xen-users@xxxxxxxxxxxxxxxxxxx
>      [4]http://lists.xensource.com/xen-users
> 
>    --
>    "We learn from failure, not from success!"
> 
> References
> 
>    Visible links
>    1. mailto:pasik@xxxxxx
>    2. http://wiki.xensource.com/xenwiki/XenLinuxPVonHVMdrivers
>    3. mailto:Xen-users@xxxxxxxxxxxxxxxxxxx
>    4. http://lists.xensource.com/xen-users

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