tcpdump mailing list archives
Re: Hardware Timestamping Problem
From: Michael Richardson <mcr () sandelman ca>
Date: Wed, 08 Jun 2016 10:24:09 -0400
{please keep it on the list for archival purposes} Christian <christian.rupp.stuttgart () freenet de> wrote: > between sender and receiver > so from the point when tcpdump grabs the time off of the Sender and to the > point where tcpdump grabs the time off of the receiver. So you are running a tcpdump on sender, using the timestamping service from the hardware, and the same on receiver, and then you send traffic? How much traffic? Is it being buffered? How do you correlate traffic? How are the *hardware* clocks being synchronzied? AFAIK, no NICs timestamp traffic on outgoing, tcpdump captures before the hardware queue. A big hardware send buffer would result in significant skew. -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | network architect [ ] mcr () sandelman ca http://www.sandelman.ca/ | ruby on rails [ _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- Hardware Timestamping Problem Christian (Jun 08)
- Re: Hardware Timestamping Problem Michael Richardson (Jun 08)
- Message not available
- Re: Hardware Timestamping Problem Michael Richardson (Jun 08)
- Re: Hardware Timestamping Problem Christian Rupp (Jun 08)
- Message not available
- Re: Hardware Timestamping Problem Michael Richardson (Jun 08)
- Re: Hardware Timestamping Problem Guy Harris (Jun 08)
- Re: Hardware Timestamping Problem Christian Rupp (Jun 08)
- Re: Hardware Timestamping Problem Guy Harris (Jun 08)
- Re: Hardware Timestamping Problem Christian (Jun 09)
- Re: Hardware Timestamping Problem Michael Richardson (Jun 08)
- Re: Hardware Timestamping Problem Guenter Ebermann (Jun 08)
- Re: Hardware Timestamping Problem Michael Richardson (Jun 09)
- Re: Hardware Timestamping Problem Christian (Jun 09)
- Re: Hardware Timestamping Problem Guenter Ebermann (Jun 09)
- Re: Hardware Timestamping Problem Christian Rupp (Jun 08)