Hello, I noticed that starting a DPDK app on one NIC messes with the PTP clock of another NIC, on a Atom C3758 system with 4 integrated NICs (X553).
So basically the DPDK initialization changes the other PTP clock's offset by 100 seconds or so. Is this to be expected with the X553 hardware/ixgbe vfio dpdk driver? Or is this a bug? Some details: lspci | grep Eth 05:00.0 Ethernet controller: Intel Corporation Ethernet Connection X553 1GbE (rev 11) 05:00.1 Ethernet controller: Intel Corporation Ethernet Connection X553 1GbE (rev 11) 06:00.0 Ethernet controller: Intel Corporation Ethernet Connection X553 1GbE (rev 11) 06:00.1 Ethernet controller: Intel Corporation Ethernet Connection X553 1GbE (rev 11) The second device (eno2) is bound to dpdk like this: /opt/dpdk-20.11.2/bin/dpdk-devbind.py --bind vfio-pci 05:00.1 The NICs have 2 PTP clocks: for i in 1 3 4; do echo $i $(ethtool -T eno$i | grep Clock); done 1 PTP Hardware Clock: 0 3 PTP Hardware Clock: 1 4 PTP Hardware Clock: none I'm a bit surprised that eno4 don't have a PTP clock, perhaps it's shared with eno3 - but then the line should read '4 PTP Hardware Clock: 1', shouldn't it? I'm running phc2sys like this: taskset -c 6 phc2sys -s CLOCK_REALTIME -c /dev/ptp1 -E linreg -m -q -O0 -S 0.00002 phc2sys[20652.182]: /dev/ptp1 sys offset -27 s0 freq -24325 delay 2251 phc2sys[20653.182]: /dev/ptp1 sys offset -29 s0 freq -24325 delay 2249 phc2sys[20654.182]: /dev/ptp1 sys offset 11 s0 freq -24325 delay 2300 phc2sys[20655.182]: /dev/ptp1 sys offset -20 s2 freq -24326 delay 2245 phc2sys[20656.182]: /dev/ptp1 sys offset -15 s2 freq -24336 delay 2251 [..] phc2sys[20668.184]: /dev/ptp1 sys offset -34 s2 freq -24328 delay 2251 phc2sys[20669.184]: /dev/ptp1 sys offset -92 s2 freq -24376 delay 2261 phc2sys[20670.184]: /dev/ptp1 sys offset 17 s2 freq -24300 delay 2261 phc2sys[20671.184]: /dev/ptp1 sys offset -63 s2 freq -24351 delay 2251 <-- simple DPDK application is started phc2sys[20672.184]: clockcheck: clock jumped backward or running slower than expected! phc2sys[20672.184]: /dev/ptp1 sys offset -500186598241 s0 freq -24351 delay 2249 phc2sys[20673.184]: /dev/ptp1 sys offset -500186598213 s0 freq -24351 delay 2248 phc2sys[20674.184]: /dev/ptp1 sys offset -500186598126 s0 freq -24351 delay 2248 phc2sys[20675.184]: clockcheck: clock jumped backward or running slower than expected! phc2sys[20675.184]: /dev/ptp1 sys offset -502999994984 s0 freq -24351 delay 2283 phc2sys[20676.184]: /dev/ptp1 sys offset -502999994973 s0 freq -24351 delay 2248 phc2sys[20677.185]: /dev/ptp1 sys offset -502999994944 s0 freq -24351 delay 2258 phc2sys[20678.185]: /dev/ptp1 sys offset -502999994990 s1 freq -24331 delay 2248 phc2sys[20679.185]: /dev/ptp1 sys offset 72 s2 freq -24287 delay 2248 phc2sys[20680.185]: /dev/ptp1 sys offset 33 s2 freq -24295 delay 2259 phc2sys[20681.185]: /dev/ptp1 sys offset 29 s2 freq -24263 delay 2289 Best regards Georg -- 'Elegance is not a dispensable luxury but a quality that decides between success and failure' (E. W. Dijkstra, ACM Symnp. on Appl. Comp., 1999) _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
