Looks like a straightforward sequencing issue. We should set vlib_mains[next_thread_index]->check_frame_queues = 1 after marking the frame queue element valid / calling vlib_put_frame_queue_elt, not when switching to a new destination queue.
I'll push a patch for you to test. HTH... Dave From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Ni, Hongjun Sent: Friday, November 8, 2019 1:44 AM To: vpp-dev@lists.fd.io; Dave Barach (dbarach) <dbar...@cisco.com> Cc: Noonan, Gordon <gordon.noo...@intel.com>; Liu, Yu Y <yu.y....@intel.com> Subject: [vpp-dev] (VPP-1734) Worker Thread stops reading from its Handoff Queue Hi folks, Could some guy help to take a look at this issue: https://jira.fd.io/browse/VPP-1734 The issue is a side effect of changes introduced by https://github.com/FDio/vpp/commit/80965f599aa90288c8c139e7e3a31726b89eb9a4#diff-f660570fc2dc57455f2c52b20880bfd8 in VPP 19.04. It's a difficult / unpredictable issue to reproduce but it when worker handoff is enabled on VPP and sufficient load is applied, then after a time (mins/hours) one or more workers will cease handling handoff traffic and never recover. Thanks, Hongjun
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