Lines Matching full:time
24 pcap-tstamp \- packet time stamps in libpcap
26 When capturing traffic, each packet is given a time stamp representing,
27 for incoming packets, the arrival time of the packet and, for outgoing
28 packets, the transmission time of the packet. This time is an
29 approximation of the arrival or transmission time. If it is supplied by
32 arrival or transmission time:
34 if the time stamp is applied to the packet when the networking stack
37 networking device driver to poll for packets, and the time stamp might
40 between the time when the last bit of the packet is received by the
41 capture device and when the networking stack time-stamps the packet;
43 the timer used to generate the time stamps might have low resolution,
50 adjusted upwards or downwards over time and the timer might not be able
53 the host operating system's clock might be adjusted over time to match a
54 time standard to which the host is being synchronized, which might be
59 running at different speeds, or might not have time counters all
60 synchronized, so packets time-stamped by different cores might not have
61 consistent time stamps.
63 In addition, packets time-stamped by different cores might be
64 time-stamped in one order and added to the queue of packets for libpcap
65 to read in another order, so time stamps might not be monotonically
68 Some capture devices on some platforms can provide time stamps for
69 packets; those time stamps are usually high-resolution time stamps, and
71 packet arrives, and are thus more accurate than time stamps provided by
72 the host operating system. Those time stamps might not, however, be
74 example, the time stamp of a packet might not correspond to the time
78 might allow different types of time stamp to be used. The
84 a list of time stamp types supported by the capture device for that
86 The list might be empty, in which case no choice of time stamp type is
93 call to specify the type of time stamp to be used on the device.
94 The time stamp types are listed here; the first value is the #define to
102 Time stamp provided by the host on which the capture is being done. The
103 precision of this time stamp is unspecified; it might or might not be
107 Time stamp provided by the host on which the capture is being done.
108 This is a low-precision time stamp, synchronized with the host operating
112 Time stamp provided by the host on which the capture is being done.
113 This is a high-precision time stamp; it might or might not be
119 Time stamp provided by the network adapter on which the capture is being
120 done. This is a high-precision time stamp, synchronized with the host
124 Time stamp provided by the network adapter on which the capture is being
125 done. This is a high-precision time stamp; it is not synchronized with
