Cost of Hardware Timestamp addition
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Shoonya
Jan 11, 2018, 2:55:47 AM1/11/18
to mechanical-sympathy
Hi
In all documentation, all i find is that hardware timestamping happens at line rate with minimal latency.
Any pointers to how much latency is added as a result of hardware timestamping of the network packets.
Regards
Shoonya
In all documentation, all i find is that hardware timestamping happens at line rate with minimal latency.
Any pointers to how much latency is added as a result of hardware timestamping of the network packets.
Regards
Shoonya
Peter Booth
Jan 11, 2018, 4:12:08 PM1/11/18
to mechanical-sympathy
Its my belief that different vendors implement timestamping differently but that, at least for
Arista's low latency switches (7150 series) there is no latency impact, that timestamps
are captured on ingress and written on egress. Note that the hires timestamps roll about
every 6 seconds and you need a keyframe to convert the timestamp to UTC
Peter
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