Hi Colin, Your assumption was right. Most often than not, a binary API/CLI call results in a vlib_worker_thread_barrier_sync because most handlers and cli are not mp safe. As a consequence, vpp may experience packet loss.
One way around this issue, for binary APIs, is to make sure the handler you’re interested in is thread safe and then mark it is_mp_safe in api_main. See, for instance, VL_API_IP_ADD_DEL_ROUTE. Hope this helps, Florin > On Aug 22, 2017, at 1:11 AM, Colin Tregenza Dancer via vpp-dev > <vpp-dev@lists.fd.io> wrote: > > I might have just missed it, but looking through the ongoing regression tests > I can’t see anything that explicitly tests for packet loss during CLI/API > commands, so I’m wondering whether minimization of packet loss during > configuration is viewed as a goal for vpp? > > Many/most of the real world applications I’ve been exploring require the > ability to reconfigure live systems without impacting the existing flows > related to stable elements (route updates, tunnel add/remove, VM > addition/removal), and it would be great to understand how this fit with vpp > use cases. > > Thanks again, > > Colin. > <> > From: vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] On > Behalf Of Colin Tregenza Dancer via vpp-dev > Sent: 19 August 2017 12:17 > To: vpp-dev@lists.fd.io > Subject: [vpp-dev] Packet loss on use of API & cmdline > > Hi, > > I’ve been doing some prototyping and load testing of the vpp dataplane, and > have observed packet loss when I issue API requests or use the debug command > line. Is this to be expected given the use of the worker_thread_barrier, or > might there be some way I could improve matters? > > Currently I’m running a fairly modest 2Mpps throughput between a pair of 10G > ports on an Intel X520 NIC, with baremetal Ubuntu 16, & vpp 17.01. > > Thanks in advance, > > Colin. > _______________________________________________ > vpp-dev mailing list > vpp-dev@lists.fd.io > https://lists.fd.io/mailman/listinfo/vpp-dev
_______________________________________________ vpp-dev mailing list vpp-dev@lists.fd.io https://lists.fd.io/mailman/listinfo/vpp-dev
