This is the log of what i get from ConnectX-3 when sending packets once a second and measuring send time via hardware timestamp.
Socket is set to SOF_TIMESTAMPING_RAW_HARDWARE | SOF_TIMESTAMPING_TX_HARDWARE
For more comprehensive look i also printed CLOCK_REALTIME value and marked weird incrementions with red
At the end there is my code attached
CLOCK_REALTIME 1409133414.922358549 SO_TIMESTAMPING RAW_HW 1452773032.164981761
CLOCK_REALTIME 1409133415.922450100 SO_TIMESTAMPING RAW_HW 1452773033.166702258
CLOCK_REALTIME 1409133416.922537592 SO_TIMESTAMPING RAW_HW 1452773034.168400791
CLOCK_REALTIME 1409133417.922624391 SO_TIMESTAMPING RAW_HW 1452773035.170099137
CLOCK_REALTIME 1409133418.922710983 SO_TIMESTAMPING RAW_HW 1452773036.171796809
CLOCK_REALTIME 1409133419.922799435 SO_TIMESTAMPING RAW_HW 1452773037.173492946
CLOCK_REALTIME 1409133420.922888341 SO_TIMESTAMPING RAW_HW 1452773038.175191439
CLOCK_REALTIME 1409133421.922978729 SO_TIMESTAMPING RAW_HW 1452773039.176891472
CLOCK_REALTIME 1409133422.923069874 SO_TIMESTAMPING RAW_HW 1452773040.178592702
CLOCK_REALTIME 1409133423.923159011 SO_TIMESTAMPING RAW_HW1452773041.180294710
CLOCK_REALTIME 1409133424.923248293 SO_TIMESTAMPING RAW_HW 1453864032.594656210
CLOCK_REALTIME 1409133425.923340046 SO_TIMESTAMPING RAW_HW 1453864033.596356630
CLOCK_REALTIME 1409133426.923432902 SO_TIMESTAMPING RAW_HW 1453864034.598059037
CLOCK_REALTIME 1409133427.923524994 SO_TIMESTAMPING RAW_HW 1453864035.599761812
CLOCK_REALTIME 1409133428.923618011 SO_TIMESTAMPING RAW_HW 1453864036.601465770
CLOCK_REALTIME 1409133429.923709575 SO_TIMESTAMPING RAW_HW 1453864037.603168542
CLOCK_REALTIME 1409133430.923801573 SO_TIMESTAMPING RAW_HW 1453864038.604871288
CLOCK_REALTIME 1409133431.923894170 SO_TIMESTAMPING RAW_HW 1453864039.606574553
CLOCK_REALTIME 1409133432.923985690 SO_TIMESTAMPING RAW_HW 1453864040.608277794
CLOCK_REALTIME 1409133433.924077954 SO_TIMESTAMPING RAW_HW 1453864041.609980035
CLOCK_REALTIME 1409133434.924169619 SO_TIMESTAMPING RAW_HW 1453864042.611683259
CLOCK_REALTIME 1409133435.924263671 SO_TIMESTAMPING RAW_HW 1453864043.613386144
CLOCK_REALTIME 1409133436.924356726 SO_TIMESTAMPING RAW_HW 1453864044.615091174
CLOCK_REALTIME 1409133437.924450008 SO_TIMESTAMPING RAW_HW 1453864045.616794860
CLOCK_REALTIME 1409133438.924544181 SO_TIMESTAMPING RAW_HW 1453864046.618500153
CLOCK_REALTIME 1409133439.924640654 SO_TIMESTAMPING RAW_HW 1453864047.620207020
CLOCK_REALTIME 1409133440.924735552 SO_TIMESTAMPING RAW_HW 1454955039.034572982
CLOCK_REALTIME 1409133441.924831349 SO_TIMESTAMPING RAW_HW 1454955040.036279254
CLOCK_REALTIME 1409133442.924926487 SO_TIMESTAMPING RAW_HW 1454955041.037985441
CLOCK_REALTIME 1409133443.925009208 SO_TIMESTAMPING RAW_HW 1454955042.039691374
CLOCK_REALTIME 1409133444.925101320 SO_TIMESTAMPING RAW_HW 1454955043.041382775
CLOCK_REALTIME 1409133445.925196659 SO_TIMESTAMPING RAW_HW 1454955044.043087010
CLOCK_REALTIME 1409133446.925290142 SO_TIMESTAMPING RAW_HW 1454955045.044793134
CLOCK_REALTIME 1409133447.925385371 SO_TIMESTAMPING RAW_HW 1454955046.046497698
CLOCK_REALTIME 1409133448.925482155 SO_TIMESTAMPING RAW_HW 1454955047.048205673
CLOCK_REALTIME 1409133449.925577588 SO_TIMESTAMPING RAW_HW 1454955048.049911643
CLOCK_REALTIME 1409133450.925683983 SO_TIMESTAMPING RAW_HW 1454955049.051617947
CLOCK_REALTIME 1409133451.925790966 SO_TIMESTAMPING RAW_HW 1454955050.053348054
CLOCK_REALTIME 1409133452.925883359 SO_TIMESTAMPING RAW_HW 1454955051.055052745
CLOCK_REALTIME 1409133453.925973609 SO_TIMESTAMPING RAW_HW 1454955052.056755697
CLOCK_REALTIME 1409133454.926064704 SO_TIMESTAMPING RAW_HW 1454955053.058461114
CLOCK_REALTIME 1409133455.926152543 SO_TIMESTAMPING RAW_HW 1454955054.060160410
CLOCK_REALTIME 1409133456.926241248 SO_TIMESTAMPING RAW_HW 1454955055.061858881
CLOCK_REALTIME 1409133457.926329456 SO_TIMESTAMPING RAW_HW 1456046046.476218983
CLOCK_REALTIME 1409133458.926417483 SO_TIMESTAMPING RAW_HW 1456046047.477918186
CLOCK_REALTIME 1409133459.926506344 SO_TIMESTAMPING RAW_HW 1456046048.479617302
CLOCK_REALTIME 1409133460.926595843 SO_TIMESTAMPING RAW_HW 1456046049.481317369
CLOCK_REALTIME 1409133461.926683579 SO_TIMESTAMPING RAW_HW 1456046050.483017120