hello,
Have connected two servers (Intel NIC: XXV710) with 10Gige interface. One
server is running PTP master instance and another server is running PTP slave
instance. With no data traffic the rms and path delay seems to be stable.
ptp4l[6406.152]: rms 4 max 9 freq +6569 +/- 6 delay 508 +/-
2ptp4l[6407.152]: rms 3 max 5 freq +6563 +/- 3 delay 506 +/- 1
On start of data traffic between two servers using iperf, observing changes in
rms value and path delay. This observation is seen with L2 and UDPv4 PTP (*dscp
0 and 56) packets
ptp4l[6408.152]: rms 67 max 128 freq +6627 +/- 106 delay 508 +/-
1ptp4l[6409.154]: rms 72 max 133 freq +6544 +/- 112 delay 517 +/-
23ptp4l[6410.154]: rms 90 max 144 freq +6562 +/- 150 delay 527 +/-
23ptp4l[6411.154]: rms 63 max 104 freq +6538 +/- 104 delay 508 +/-
8ptp4l[6412.155]: rms 67 max 132 freq +6553 +/- 111 delay 515 +/-
14ptp4l[6413.155]: rms 84 max 140 freq +6581 +/- 137 delay 527 +/-
28ptp4l[6414.155]: rms 69 max 128 freq +6616 +/- 110 delay 507 +/- 1
Also took capture of T1, T2,T3,T4, T2-T1 (T21), T4-T3 (T43), path
delayptp4l[6406.152]: rms 4 max 9 freq +6569 +/- 6 delay 508 +/-
2ptp4l[6406.163]: T1: 1607668933978332926 T2: 1607668933978333430 T3:
1607668933989154991 T4: 1607668933989155498 T21: 504 T43:
507Delay 000505ptp4l[6406.194]: T1: 1607668933978332926 T2: 1607668933978333430
T3: 1607668934020041703 T4: 1607668934020042211 T21: 504 T43:
508Delay 000506ptp4l[6406.259]: T1: 1607668934040846948 T2: 1607668934040847451
T3: 1607668934085132527 T4: 1607668934085133034 T21: 503 T43:
507Delay 000505ptp4l[6406.348]: T1: 1607668934165872425 T2: 1607668934165872928
T3: 1607668934174021441 T4: 1607668934174021949 T21: 503 T43:
508Delay 000505ptp4l[6406.430]: T1: 1607668934228384783 T2: 1607668934228385285
T3: 1607668934256596316 T4: 1607668934256596826 T21: 502 T43:
510Delay 000506ptp4l[6406.541]: T1: 1607668934353412209 T2: 1607668934353412711
T3: 1607668934367710006 T4: 1607668934367710516 T21: 502 T43:
510Delay 000506ptp4l[6406.639]: T1: 1607668934415925354 T2: 1607668934415925855
T3: 1607668934465243375 T4: 1607668934465243886 T21: 501 T43:
511Delay 000506ptp4l[6406.650]: T1: 1607668934415925354 T2: 1607668934415925855
T3: 1607668934476591060 T4: 1607668934476591572 T21: 501 T43:
512Delay 000506ptp4l[6406.741]: T1: 1607668934540954347 T2: 1607668934540954849
T3: 1607668934567698773 T4: 1607668934567699286 T21: 502 T43:
513Delay 000507ptp4l[6406.827]: T1: 1607668934603466942 T2: 1607668934603467444
T3: 1607668934653828345 T4: 1607668934653828859 T21: 502 T43:
514Delay 000508ptp4l[6406.845]: T1: 1607668934665977018 T2: 1607668934665977520
T3: 1607668934671788093 T4: 1607668934671788606 T21: 502 T43:
513Delay 000507ptp4l[6406.927]: T1: 1607668934728500806 T2: 1607668934728501308
T3: 1607668934753452235 T4: 1607668934753452748 T21: 502 T43:
513Delay 000507ptp4l[6407.032]: T1: 1607668934853528376 T2: 1607668934853528878
T3: 1607668934858017297 T4: 1607668934858017810 T21: 502 T43:
513Delay 000507ptp4l[6407.045]: T1: 1607668934853528376 T2: 1607668934853528878
T3: 1607668934871270122 T4: 1607668934871270637 T21: 502 T43:
515Delay 000508ptp4l[6407.139]: T1: 1607668934916043297 T2: 1607668934916043799
T3: 1607668934965566527 T4: 1607668934965567040 T21: 502 T43:
513Delay 000507
###############
After starting of iperf data################ptp4l[6408.152]: rms 67 max 128
freq +6627 +/- 106 delay 508 +/- 1ptp4l[6408.168]: T1: 1607668935978833248
T2: 1607668935978833833 T3: 1607668935994738984 T4: 1607668935994739545 T21:
585 T43: 561Delay 000573ptp4l[6408.179]: T1: 1607668935978833248 T2:
1607668935978833833 T3: 1607668936005546745 T4: 1607668936005547310 T21:
585 T43: 565Delay 000575ptp4l[6408.301]: T1: 1607668936103831742 T2:
1607668936103832201 T3: 1607668936127552766 T4: 1607668936127553320 T21:
459 T43: 554Delay 000506ptp4l[6408.325]: T1: 1607668936103831742 T2:
1607668936103832201 T3: 1607668936151593703 T4: 1607668936151594254 T21:
459 T43: 551Delay 000505ptp4l[6408.416]: T1: 1607668936228857803 T2:
1607668936228858277 T3: 1607668936242881777 T4: 1607668936242882316 T21:
474 T43: 539Delay 000506ptp4l[6408.481]: T1: 1607668936292520853 T2:
1607668936292521328 T3: 1607668936307453227 T4: 1607668936307453762 T21:
475 T43: 535Delay 000505ptp4l[6408.576]: T1: 1607668936355034717 T2:
1607668936355035199 T3: 1607668936401914109 T4: 1607668936401914638 T21:
482 T43: 529Delay 000505ptp4l[6408.577]: T1: 1607668936355034717 T2:
1607668936355035199 T3: 1607668936403755233 T4: 1607668936403755763 T21:
482 T43: 530Delay 000506ptp4l[6408.619]: T1: 1607668936417546475 T2:
1607668936417546964 T3: 1607668936445330552 T4: 1607668936445331080 T21:
489 T43: 528Delay 000508ptp4l[6408.656]: T1: 1607668936480060464 T2:
1607668936480060949 T3: 1607668936482617895 T4: 1607668936482618421 T21:
485 T43: 526Delay 000505ptp4l[6408.735]: T1: 1607668936542574514 T2:
1607668936542575008 T3: 1607668936560997268 T4: 1607668936560997792 T21:
494 T43: 524Delay 000509ptp4l[6408.845]: T1: 1607668936667615362 T2:
1607668936667615982 T3: 1607668936671130675 T4: 1607668936671131197 T21:
620 T43: 522Delay 000571ptp4l[6408.900]: T1: 1607668936667615362 T2:
1607668936667615982 T3: 1607668936726357569 T4: 1607668936726358100 T21:
620 T43: 531Delay 000575ptp4l[6408.922]: T1: 1607668936730114616 T2:
1607668936730115092 T3: 1607668936748221189 T4: 1607668936748221722 T21:
476 T43: 533Delay 000504ptp4l[6409.036]: T1: 1607668936855142568 T2:
1607668936855143039 T3: 1607668936862872019 T4: 1607668936862872560 T21:
471 T43: 541Delay 000506ptp4l[6409.043]: T1: 1607668936855142568 T2:
1607668936855143039 T3: 1607668936869861619 T4: 1607668936869862159 T21:
471 T43: 540Delay 000505ptp4l[6409.108]: T1: 1607668936917658810 T2:
1607668936917659281 T3: 1607668936934325176 T4: 1607668936934325715 T21:
471 T43: 539Delay 000505ptp4l[6409.153]: T1: 1607668936917658810 T2:
1607668936917659281 T3: 1607668936979810403 T4: 1607668936979810939 T21:
471 T43: 536Delay 000503
Even doing core pinning for ptp4l process is not solving the issue of increased
rms value and variation of path delay.
Can you please help here?1) Is this NIC driver issue? Driver transmitting
packet late after time stamping or time stamping the received packet late?2)
Since we don't have qos as Layer two level, is this impacting in sending the
ptp packets on time?
Please suggest.
Regards,Ramesh
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