> On Jan 9, 2020, at 5:04 AM, otr...@employees.org wrote: > > Hi Christian, > >> It looks like the only access to stats though is from shared memory. I guess >> running vpp_get_stats with ssh is the way to fetch the counters in this >> case. It would be nice if there was an API in VPP that mimic'd the >> vpp_get_stats functionality though. Could even expose that to the CLI. >> >> I really just want the interface and error counts for now, was a little >> surprised there was no API for this (since it exists in the CLI). > > That is on purpose. > The actual counters (and data structures) in VPP are exposed directly in the > shared memory stats segment. > That means that regardless of how often a client polls a counter, there is > little to no impact on VPP.
Understood. > An API message or CLI has some cost on the VPP side though. Sure; however, "show interface" gives me consolidated (not-per-thread) packet counters for an interface. I'm going to have to either screen scrape those for my testing, or run vpp_get_stats over another ssh connection to collect the per-thread stats. I think it might be reasonable to have a VPP API that provided these same interface counters available in the CLI w/o having to invest in interfacing to another plugin/API. > For exporting data out of the stats segment, I believe there is already quite > a few solutions. > There's the (naive) prometheus example in the repo, vpp_get_stats, there is a > Telegraf plugin, a simple gNMI/gRPC plugin. Right I've used vpp_get_stats and may run that with ssh and awk. I guess it just seems odd on first encountering this that the CLI provided the data, but the binary API didn't. I suppose the view is that exposing the stats segment in shared memory *is* the binary API. :) Thanks, Chris. > > Best regards, > Ole
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