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doc: mention RFC on interleaved modes

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The specification of the interleaved modes is now published as
RFC 9769.
This commit is contained in:
Miroslav Lichvar
2025-05-26 08:43:44 +02:00
parent 68b2ffa97c
commit 6c2ee89970
3 changed files with 11 additions and 11 deletions
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10
doc/chrony.conf.adoc
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@@ -251,11 +251,11 @@ authenticated source to be safely combined with unauthenticated sources in
order to improve the accuracy of the clock. They can be selected and used for
synchronisation only if they agree with the trusted and required source.
*xleave*:::
This option enables the interleaved mode of NTP. It enables the server to
respond with more accurate transmit timestamps (e.g. kernel or hardware
timestamps), which cannot be contained in the transmitted packet itself and
need to refer to a previous packet instead. This can significantly improve the
accuracy and stability of the measurements.
This option enables the interleaved mode of NTP (RFC 9769). It enables the
server to respond with more accurate transmit timestamps (e.g. kernel or
hardware timestamps), which cannot be contained in the transmitted packet
itself and need to refer to a previous packet instead. This can significantly
improve the accuracy and stability of the measurements.
+
The interleaved mode is compatible with servers that support only the basic
mode. Note that even

8
doc/faq.adoc
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@@ -338,10 +338,10 @@ with local NTP server
server ntp.local minpoll 2 maxpoll 4 polltarget 30 maxdelaydevratio 2
----
If your server supports the interleaved mode (e.g. it is running `chronyd`),
the `xleave` option should be added to the `server` directive to enable the
server to provide the client with more accurate transmit timestamps (kernel or
preferably hardware). For example:
If your server supports the interleaved mode (RFC 9769), e.g. it is running
`chronyd` version 3.0 or later, the `xleave` option should be added to the
`server` directive to enable the server to provide the client with more
accurate transmit timestamps (kernel or preferably hardware). For example:
----
server ntp.local minpoll 2 maxpoll 4 xleave

4
ntp_core.c
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@@ -1960,7 +1960,7 @@ process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
/* The skew and estimated frequency offset relative to the remote source */
double skew, source_freq_lo, source_freq_hi;
/* RFC 5905 packet tests */
/* RFC 5905 and RFC 9769 packet tests */
int test1, test2n, test2i, test2, test3, test5, test6, test7;
int interleaved_packet, valid_packet, synced_packet;
@@ -2024,7 +2024,7 @@ process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
pkt_root_dispersion = UTI_Ntp32ToDouble(message->root_dispersion);
}
/* Check if the packet is valid per RFC 5905, section 8.
/* Check if the packet is valid per RFC 5905 (section 8) and RFC 9769.
The test values are 1 when passed and 0 when failed. */
/* Test 1 checks for duplicate packet */