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[atlas] negative RTT?
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Philip Homburg
philip.homburg at ripe.net
Tue Apr 14 10:58:34 CEST 2015
Hi Paul,
On 2015/04/13 23:58 , Paul Vlaar wrote:
> I noticed that one of my DNS UDMs gave back a negative RTT:
>
> {"af":4,"dst_addr":"199.19.57.1","from":"171.98.64.220","fw":4680,"group_id":1957244,"lts":39041,"msm_id":1957244,"msm_name":"Tdig","prb_id":22726,"proto":"UDP","result":{"ANCOUNT":1,"ARCOUNT":1,"ID":8401,"NSCOUNT":0,"QDCOUNT":1,"abuf":"INGEAAABAAEAAAABA29yZwAABgABwAwABgABAAADhAAzAmEwA29yZwthZmlsaWFzLW5zdARpbmZvAANub2PAKHfkW2sAAAcIAAADhAAJOoAAAVGAAAApEAAAAAAAACYAAwAibnMwMDBiLmFwcDI3LmlhZDEuYWZpbGlhcy1uc3QuaW5mbw==","answers":[{"MNAME":"a0.org.afilias-nst.info.","NAME":"org.","RNAME":"noc.afilias-nst.info.","SERIAL":2011454315,"TTL":900,"TYPE":"SOA"}],"rt":-14281.576,"size":133},"src_addr":"192.168.1.51","timestamp":1428948041,"type":"dns"}
>
> -14281.576ms was standing out like a sore thumb on the graph that I
> create out of the results from these UDMs.
This can be fixed by switching the measurement code to one of the
alternative time sources in the Linux kernel that is not subject to
these jumps. However that requires touching all time related code in the
measurement code.
Philip
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