FWIW, master/latest continues to pass traffic w/ “date -s” deltas of both plus and minus a couple of minutes. This is not a huge surprise, nor is it a surprise that stable/1801 fails miserably under similar albeit less draconian circumstances.
The algorithm changes mentioned below don’t involve a lot of code, but they are pretty first-order important. HTH... Dave From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Dave Barach via Lists.Fd.Io Sent: Friday, February 7, 2020 10:53 AM To: siddarth rai <sid...@gmail.com>; vpp-dev <vpp-dev@lists.fd.io> Cc: vpp-dev@lists.fd.io Subject: Re: [vpp-dev] VPP main threads gets stuck when system time is changed Try patching src/vppinfra/time.[ch] from master/latest. The algorithms involved have been changed quite a bit since 18.01... Dave From: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> On Behalf Of siddarth rai Sent: Friday, February 7, 2020 9:17 AM To: vpp-dev <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> Subject: [vpp-dev] VPP main threads gets stuck when system time is changed Hi, We have VPP 1801 in one of our systems. I understand the support for VPP 1801 is not there anymore , but requesting for any advice nevertheless. System time is changed by a few seconds using 'date -s'. Then the VPP main thread goes to 100% CPU utilization. The issue is only reproduced when the traffic is running. I attached gdb to VPP and saw that while the worker thread is working normally, the main thread seems to be stuck at clib_cpu_time_now. https://pastebin.com/iJm0uZqx Also, here is the bt of main : https://pastebin.com/CSjv4KsW Please help. Any pointers will be much appreciated Regards, Siddarth
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