An Updated Performance Comparison of Virtual Machines and Linux Containers [pdf]

Re:An Updated Performance Comparison of Virtual Machines and... by tinco on Thursday August 07, 2014 @06:27AM (#8146984)

Interesting that using vETH and NAT causes around 20% extra latency and around 20% less throughput. Is this expected from these technologies?

I was expecting them to have no significant impact at all, since surely the hardware NIC would be the bottleneck? perhaps the kernel is doing some memcpy'ing to achieve these features?

Then again, 10gbps NIC is quite fast, perhaps this performance losses are less significant with more reasonable 100mbit/1gbit interfaces?

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Re:An Updated Performance Comparison of Virtual Machines and... by zdw on Thursday August 07, 2014 @09:55AM (#8147696)

NAT requires each and every packet to be rewritten with different source (or destination, or both, depending on the flavor) IP addressing information, so it isn't just a simple copy.

Drivers and sanity checking what's going in/out of the VM probably account for the rest. Hardware may be fast but adding layers of complexity will have a performance impact.

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