FYI: fixing Vista networking with rtl8139 + KVM

FYI: fixing Vista networking with rtl8139 + KVM

[Daniel P. Berrange]

A Fedora user reported that Vista networking isn't working with KVM[1] and
pointed to the Wiki

  http://kvm.qumranet.com/kvmwiki/Vista_Networking_Workaround

FYI, a patch from Xen was merged into upstream QEMU to fix this problem
with rtl8139 a week or two back and works nicely with KVM+Vista...

   http://www.mail-archive.com/qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org/msg11365.html

..avoiding need for messing around with ne2k drivers as mentioned in the wiki

Regards,
Dan.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=308201
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Re: FYI: fixing Vista networking with rtl8139 + KVM

[Farkas Levente]

Daniel P. Berrange wrote:
> A Fedora user reported that Vista networking isn't working with KVM[1] and
> pointed to the Wiki
> 
>   http://kvm.qumranet.com/kvmwiki/Vista_Networking_Workaround
> 
> FYI, a patch from Xen was merged into upstream QEMU to fix this problem
> with rtl8139 a week or two back and works nicely with KVM+Vista...
> 
>    http://www.mail-archive.com/qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org/msg11365.html
> 
> ..avoiding need for messing around with ne2k drivers as mentioned in the wiki
> 
> Regards,
> Dan.
> 
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=308201

does this means that in general use the ne2k driver is a better choice?
anyway is there a suggested network driver for the guests?

-- 
  Levente                               "Si vis pacem para bellum!"

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Re: FYI: fixing Vista networking with rtl8139 + KVM

[Avi Kivity]

Farkas Levente wrote:
> Daniel P. Berrange wrote:
>   
>> A Fedora user reported that Vista networking isn't working with KVM[1] and
>> pointed to the Wiki
>>
>>   http://kvm.qumranet.com/kvmwiki/Vista_Networking_Workaround
>>
>> FYI, a patch from Xen was merged into upstream QEMU to fix this problem
>> with rtl8139 a week or two back and works nicely with KVM+Vista...
>>
>>    http://www.mail-archive.com/qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org/msg11365.html
>>
>> ..avoiding need for messing around with ne2k drivers as mentioned in the wiki
>>
>> Regards,
>> Dan.
>>
>> [1] https://bugzilla.redhat.com/show_bug.cgi?id=308201
>>     
>
> does this means that in general use the ne2k driver is a better choice?
> anyway is there a suggested network driver for the guests?
>
>   

No, it means I need to merge qemu-cvs.

rtl8139 performs faster than ne2000.

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Re: FYI: fixing Vista networking with rtl8139 + KVM

[Laurent Vivier]

[-- Attachment #1.1: Type: text/plain, Size: 1167 bytes --]

Avi Kivity wrote:
> Farkas Levente wrote:
>> Daniel P. Berrange wrote:
>>   
>>> A Fedora user reported that Vista networking isn't working with KVM[1] and
>>> pointed to the Wiki
>>>
>>>   http://kvm.qumranet.com/kvmwiki/Vista_Networking_Workaround
>>>
>>> FYI, a patch from Xen was merged into upstream QEMU to fix this problem
>>> with rtl8139 a week or two back and works nicely with KVM+Vista...
>>>
>>>    http://www.mail-archive.com/qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org/msg11365.html
>>>
>>> ..avoiding need for messing around with ne2k drivers as mentioned in the wiki
>>>
>>> Regards,
>>> Dan.
>>>
>>> [1] https://bugzilla.redhat.com/show_bug.cgi?id=308201
>>>     
>> does this means that in general use the ne2k driver is a better choice?
>> anyway is there a suggested network driver for the guests?
>>
>>   
> 
> No, it means I need to merge qemu-cvs.
> 
> rtl8139 performs faster than ne2000.

But adding CRC computing in RTL839 should have some impacts on performance.

Laurent
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------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org  --------------
          "Software is hard" - Donald Knuth


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Re: FYI: fixing Vista networking with rtl8139 + KVM

[Avi Kivity]

Laurent Vivier wrote:
> Avi Kivity wrote:
>   
>> Farkas Levente wrote:
>>     
>>> Daniel P. Berrange wrote:
>>>   
>>>       
>>>> A Fedora user reported that Vista networking isn't working with KVM[1] and
>>>> pointed to the Wiki
>>>>
>>>>   http://kvm.qumranet.com/kvmwiki/Vista_Networking_Workaround
>>>>
>>>> FYI, a patch from Xen was merged into upstream QEMU to fix this problem
>>>> with rtl8139 a week or two back and works nicely with KVM+Vista...
>>>>
>>>>    http://www.mail-archive.com/qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org/msg11365.html
>>>>
>>>> ..avoiding need for messing around with ne2k drivers as mentioned in the wiki
>>>>
>>>> Regards,
>>>> Dan.
>>>>
>>>> [1] https://bugzilla.redhat.com/show_bug.cgi?id=308201
>>>>     
>>>>         
>>> does this means that in general use the ne2k driver is a better choice?
>>> anyway is there a suggested network driver for the guests?
>>>
>>>   
>>>       
>> No, it means I need to merge qemu-cvs.
>>
>> rtl8139 performs faster than ne2000.
>>     
>
> But adding CRC computing in RTL839 should have some impacts on performance.
>
>   

It's probably negligible since the copy has placed the packet in the cache.


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Re: FYI: fixing Vista networking with rtl8139 + KVM

[Daniel P. Berrange]

On Thu, Sep 27, 2007 at 11:08:46AM +0200, Farkas Levente wrote:
> Daniel P. Berrange wrote:
> > A Fedora user reported that Vista networking isn't working with KVM[1] and
> > pointed to the Wiki
> > 
> >   http://kvm.qumranet.com/kvmwiki/Vista_Networking_Workaround
> > 
> > FYI, a patch from Xen was merged into upstream QEMU to fix this problem
> > with rtl8139 a week or two back and works nicely with KVM+Vista...
> > 
> >    http://www.mail-archive.com/qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org/msg11365.html
> > 
> > ..avoiding need for messing around with ne2k drivers as mentioned in the wiki
> > 
> > Regards,
> > Dan.
> > 
> > [1] https://bugzilla.redhat.com/show_bug.cgi?id=308201
> 
> does this means that in general use the ne2k driver is a better choice?

No, ne2k is an awful choice. It has worse performance than rtl8139 and does
not do link state reporting so things like network manager won't be able to
automatically configure the NIC in a guest. rtl8139 is the preferred choice
and in Fedora we have patched Xen, QEMU & KVM so they use rtl8139 by default

Dan.
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