emulating gigabit ethernet

emulating gigabit ethernet

[Wes]

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Hello List,

Are there any plans on emulating gigabit under qemu/kvm?

I ask because at the moment networking in guests on an ibm x3650 host is
embarrassingly slow.  Using model=rtl8139 results in max of 12% of bandwidth
utilisation @ 100mbit (which in practice equates to 10mbit performance), and
using the default model=ne2k_pci results in much faster albeit still
sub-100mbit performance (while reporting 10mbit in the guest).  Is this
something that can be worked around?  Since the x3650's we use here have 2
gigabit ports, is it possible to pass one to the guest for direct access
instead of being forced to emulate a nic then route via 8021q and tun/tap?

Thanks,
Wes

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Re: emulating gigabit ethernet

[Izik Eidus]

Wes wrote:
> Hello List,
>
> Are there any plans on emulating gigabit under qemu/kvm? 
yes, there are plans to emulate e1000, and there are para virtualzed 
drivers that should give good performance
 ( i dont know where the PV drivers will be released )
but this issue is known and work is made to solve it.
thanks.

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emulating gigabit ethernet

[Wes]

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Awesome.  I look forward to testing them :)

Wes


On 10/5/07, Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
> Wes wrote:
> > Hello List,
> >
> > Are there any plans on emulating gigabit under qemu/kvm?
> yes, there are plans to emulate e1000, and there are para virtualzed
> drivers that should give good performance
> ( i dont know where the PV drivers will be released )
> but this issue is known and work is made to solve it.
> thanks.
>

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Re: emulating gigabit ethernet

[Dor Laor]

Wes wrote:
> Hello List,
>
> Are there any plans on emulating gigabit under qemu/kvm? 
>
> I ask because at the moment networking in guests on an ibm x3650 host 
> is embarrassingly slow.  Using model=rtl8139 results in max of 12% of 
> bandwidth utilisation @ 100mbit (which in practice equates to 10mbit 
> performance), and using the default model=ne2k_pci results in much 
> faster albeit still sub-100mbit performance (while reporting 10mbit in 
> the guest).  Is this something that can be worked around?  Since the 
> x3650's we use here have 2 gigabit ports, is it possible to pass one 
> to the guest for direct access instead of being forced to emulate a 
> nic then route via 8021q and tun/tap?
It's weird the rtl gives worse performance than ne2k, it should be the 
opposite. What kvm version do you test?
Try test with the latest (Avi added a small tap performance 
improvement.) If this does not help try
to add the -no-kvm-irqchip flag to the party.

Regarding pci pass through, we have a prototype working which will be 
release soon (month).
Dor.

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Re: emulating gigabit ethernet

[Wes]

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This is with kvm-44.  I did notice kvm-45 released moments after I moved
this x3650 onsite but our client required it immediately so I didn't have a
chance to test it yet.  I'll give it a try though when we revisit the setup
in a week's time.  And i'll keep watcing this space for news on the
passthrough :)


Cheers,
Wes


On 10/6/07, Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Wes wrote:
> > Hello List,
> >
> > Are there any plans on emulating gigabit under qemu/kvm?
> >
> > I ask because at the moment networking in guests on an ibm x3650 host
> > is embarrassingly slow.  Using model=rtl8139 results in max of 12% of
> > bandwidth utilisation @ 100mbit (which in practice equates to 10mbit
> > performance), and using the default model=ne2k_pci results in much
> > faster albeit still sub-100mbit performance (while reporting 10mbit in
> > the guest).  Is this something that can be worked around?  Since the
> > x3650's we use here have 2 gigabit ports, is it possible to pass one
> > to the guest for direct access instead of being forced to emulate a
> > nic then route via 8021q and tun/tap?
> It's weird the rtl gives worse performance than ne2k, it should be the
> opposite. What kvm version do you test?
> Try test with the latest (Avi added a small tap performance
> improvement.) If this does not help try
> to add the -no-kvm-irqchip flag to the party.
>
> Regarding pci pass through, we have a prototype working which will be
> release soon (month).
> Dor.
>

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