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xen-devel
Re: [Xen-devel] etherbridge bottleneck
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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