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Re: [Xen-users] Gigabit Interface - XEN Full Virtualization

No, I mean YOU MUST do it on the domU not on the dom0.
The domU must load the unmodified compiled drivers from the xen fedora distribution src rpm that yuo compiled by hand.
The dom0 is unaffected by this procedure.
So get the xen source rpm according to your domU distribution,
compile the unmodifided drivers on the domU and load the kernel module.
remember depmod -a to register the new installed modules


Emre Erenoglu ha scritto:
Hi Riccardo, I tried to understand how you do it. I'm also trying to use my HVM domU with PV drivers. If I understand right, the important point is:

- use the source code of the XEN in the Dom0 (don't download from Xensource etc.). Is it true?

So, for example, if I'm using Fedora 8 as my Dom0, I have to download the source rpm of the xen-hypervisor that's running in Fedora 8. then go inside the unmodified_drivers and do the compilation. right?

I did like this for my system, unfortunately, either the system crashes completely or network stops working after some time... I guess there's a bug somewhere. For example, when unloading the xen-vnif module, I receive an error in dmesg talking about some "memory leak".



On Dec 2, 2007 5:08 PM, Riccardo Veraldi <Riccardo.Veraldi@xxxxxxxxxxxx <mailto:Riccardo.Veraldi@xxxxxxxxxxxx>> wrote:

    if you compile the netfront drivers on your guest kernel and load them
    as kernel module on your guests, you will have gigabit speed on a
    virtual machine, hust use netfront and not ioemu then load
    the kernel drivers on the virtual machine.
    I have written something about it but it is in italian.
    If you understand italian...


    you should understand the way to do it even if it is written in

    I can translate in english if really it is needed


    Artur Baruchi ha scritto:
    > Hi Mark,
    > Unfortunately, I did some tests, and even my nic being a giga and my
    > lan supporting giga, my full virtualized domain wasnt able to pass
    > 100Mb/sec. My paravirtualized guests had a very good performance in
    > this environment.
    > Thanks,
    > Att.
    > Artur Baruchi
    > On Dec 2, 2007 12:34 AM, Mark Williamson <
    <mailto:mark.williamson@xxxxxxxxxxxx>> wrote:
    >>>> I noted that the lspci output are different, and I would like
    to know,
    >>>> how can I make my xen virtual machine see the same Hardware,
    so I can
    >>>> force a 1000 Full speed.
    >>> You can't get Gigabit speed for your NIC in HVM.  Whatever
    network cards
    >>> you have on the physical system, it's emulated as a 10/100
    mbps Realtek
    >>> card to the HVM.
    >>> Use paravirtualized drivers for HVMs to enhance the network card
    >>> performance and throughput, but don't expect 1000 mbps.  :-)
    >> The virtual machine won't have hardware matching the physical
    system; it just
    >> sees whatever hardware Xen is emulating.
    >> Xen doesn't emulate a GigE network card so you won't be able to
    see one in the
    >> guest.  However, I suspect that the 10/100mbps card will be
    able to transmit
    >> above that speed if your machine can emulate the card fast
    enough: because
    >> there's not a real hardware 100mbps ethernet card there, there
    >> shouldn't be anything limiting the speed to that.
    >> As Sadique mentioned, if you use paravirtualised drivers in
    your guest (either
    >> by using a PV guest or by installing paravirt network drivers
    in an HVM
    >> guest) you could potentially increase the throughput and
    decrease the CPU
    >> overhead further.
    >> Cheers,
    >> Mark
    >> --
    >> Dave: Just a question. What use is a unicyle with no seat?  And
    no pedals!
    >> Mark: To answer a question with a question: What use is a
    >> Dave: Skateboards have wheels.
    >> Mark: My wheel has a wheel!
    > _______________________________________________
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    > Xen-users@xxxxxxxxxxxxxxxxxxx <mailto:Xen-users@xxxxxxxxxxxxxxxxxxx>
    > http://lists.xensource.com/xen-users

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Emre Erenoglu
erenoglu@xxxxxxxxx <mailto:erenoglu@xxxxxxxxx>

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