Re: [ovs-discuss] vswitches performance comparison

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I'd like to hope that's my methodology problem, but I just follow the
installation guide without any customization.

Hi Mark, do you have any performance data share with us? Maybe we are
using different type of workloads, like I mentioned I am using
typical data center workload, I guess you are talking about NFV type of

workload?

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The number getting floated around on the mailing list recently is
16.5Mpps for phy-phy. However, I don't think we have any iperf data
off-hand for your usecase. When we test throughput into the vm we
usually generate the traffic externally and send NIC->OVS->VM->OVS-
NIC. This is a little different to your setup.

I guess pmd driver is used inside VM in that case, right?

Yes, but even when we use virtio-net we see the same if not *slightly* better
performance.

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I do know, however, that ovs-dpdk typically has a much larger
throughput than the kernel space datapath.

I'd like to say it depends on workloads, for small/medium packet size
workload, that's definitely true, while for TSO size workload, it's not that
obvious (or worse) as data path overheads are amortized and H/W can be
leveraged.

For large packets the switch will eventually saturate the NIC at line rate but the
total aggregate throughput of the switch should be faster (you could
add more interfaces for example to take advantage of that). 

TSO is missing from the DPDK ports at the moment but it is something
we plan to look at. We are currently enabling Jumbo frames (which don't
work at the moment).

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Have you seen this?
https://wiki.opnfv.org/characterize_vswitch_performance_for_telco_nfv_
use_cases

Thanks for the pointer, I'll try later.

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Thanks,
Jun

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