Re: [Xen-devel] etherbridge bottleneck

[Bin Ren <bin.ren@xxxxxxxxx>]

Whenever you see a performance problem, please describe the following things:

(1) Is Xen running on a UP, SMP or HT?
(2) If Xen is running on a SMP or HT, are xen0 and xenU running
different processors or threads?
(3) Which scheduler in Xen are you using? Have you changed any parameters?

- Bin

On Wed, 10 Nov 2004 16:48:45 -0500, David Becker <becker@xxxxxxxxxxx> wrote:
> 
> I ran some iperf tests today and it looks like the etherbridge
> is the limiting factor on throughput.  In the beforetime, I saw great
> throughput to the VMs; over 800 Mbps.   With the bridge, the numbers
> are in the 400s somewhere.
> Is this the speed I can expect from the bridge?
> Is there some tuning I should try, or another way to get more bandwidth
> into the VMs?
> 
> This is with xen-2.0, 2.4.27-xen0 and 2.4.27-xenU.
> 
> My iperf numbers:
>  940 Mbps  stock linux -> stock linux
>  470 Mbps  stock linux -> xenU
>  533 Mbps  xenU -> stock linux
> 
> ether bridge speed
>  533 Mbps  xenU -> xen0  on the same host
>  422 Mbps  xen0 -> xenU  on the same host
> 
> loopback speed
>  4.4 Gbps  stock linux
>  3.2 Gbps  xenU
>  3.2 Gbps  xen0
> 
> (stock linux is 2.4.25)
> 
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