On Mon, 1 Dec 2014, George Neville-Neil wrote:

On a slight tangent. I ran VIMAGE kernels vs. non VIMAGE kernels for both a VANILLA kernel and a PF kernel (PF on but no rules) as a quick smoke test today. The raw forwarding performance was unchanged between kernels with and without VIMAGE on a 10G based system in the Sentex lab (lion1). I will be doing a bit more work in this area and will then put up some results in my netperf github repo.

Was this a CPU-bound or network-bound workload? In general, I'd expect VIMAGE to have a modest overhead for most measurable workloads .. unless you are CPU-bound, in which case per-packet processing overheads might become (potentially) quite visible. They will also be more visible on simpler pipelines and with less cache-rich designs -- e.g., SoCs of various sorts. Doing a bit of CPU-bound networking on a modest ARM core might show off the effects better.

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