NDDS

Effect of TRANSPORT_PRIORITY Qos Policy on the metatraffic (Heartbeats, Acks, Nacks, Gaps)

The TRANSPORT_PRIORITY DataWriter Qos Policy controls the transport-level priority settings. Each transport maps it to a transport-specific prioritization mechanism which in the case of UDP are the IP packet diffserv ToS/DSCP bits . Out-of-the box this feature is not enabled, but this forum thread ...
Gerardo Pardo
Tue, 02/11/2014 - 20:02
4917 reads — 0 comments

How can I reduce the latency of my data?

By default, RTI Connext DDS sends data with very low latency. However, the latency of your data depends on several factors, including: The latency of your network hardware The congestion on your network The priority of the threads that receive your data You may not be able to control your network, ...
rose
Thu, 06/13/2013 - 18:11
5306 reads — 0 comments

How do I tune the network buffering in VxWorks 5.4?

Note: Applies to NDDS 3.0 and VxWorks 5.4. Introduction The VxWorks TCP/IP stack uses a fixed amount of buffers. The buffers and their sizes are configured in the kernel. This is different from non real-time OSs, where the buffers can be taken as needed from main memory. In many NDDS applications ...
abhi
Thu, 01/17/2013 - 13:22
26369 reads — 0 comments

How do I transition my NDDS 3.x application to RTI Connext 4.x and above?

Note: Applies to NDDS 3.x and RTI Connext 4.x and above First, it is important to point out that NDDS 3.x and RTI Connext 4.x and above are not wire-protocol compatible. Applications built with these 2 products cannot communicate with each other. Second, although the object models of both products ...
yusheng
Thu, 01/17/2013 - 12:40
3902 reads — 0 comments

Why do I get an inconsistent QoS error when recompiling my 4.1e application for 4.2e?

One of the more common reasons is due to the parameter late_joiner_heartbeat_period (part of DDS_RtpsReliableWriterProtocol_t , used in the DataWriterProtocolQosPolicy and DisoveryConfigQosPolicy ) which is new in RTI Data Distribution Service 4.2. late_joiner_heartbeat_period is used when a ...
gianpiero
Thu, 01/17/2013 - 12:03
5120 reads — 0 comments

How can I improve my throughput performance on Linux?

One potential cause of poor performance on a Linux system is the amount of buffer space the RHEL 4u4 kernel uses to reassemble IP fragments. The parameters in /proc/sys/net/ipv4 control various aspects of the network, including a parameter that controlls the reassembly buffer size. ...
gianpiero
Thu, 01/17/2013 - 11:47
18763 reads — 0 comments

How do I resolve a problem with VxWorks buffers?

Note: Applies to NDDS 3.x and earlier, RTI Data Distribution Service 4.0 and 4.1 To monitor the state of the data buffer usage inside the stack, you can use the netStackDataPoolShow or mbufShow functions. Both commands give the same information. If the stack has been running out of clusters, these ...
dstockdill
Thu, 01/17/2013 - 11:27
8389 reads — 0 comments

How do I use the RtiNtpTime structure?

Note: Applies to NDDS 3.x. NDDS's internal time representation is in NTP format rather than DDS_Time for computational efficiency reasons. The header osapi/osapi_ntptime.h defines NTP time class ( struct RTINtpTime ) as well as its manipulation methods. A brief excerpt from this header file is ...
gianpiero
Thu, 01/17/2013 - 11:26
3858 reads — 0 comments

What are "heartbearts" and how are they used in RTI Data Distribution Service 3.x?

Note : The following discussion applies to RTI Data Distribution Service 3.x only. (There is a separate FAQ for 4.x.) Heartbeats (HBs) are sent for one of two reasons: Every SendQueueSize / HeartBeatsPerSendQueue issues, RTI Data Distribution Service will append a HB to the issue to request that it ...
Juanjo Martin
Thu, 01/17/2013 - 08:44
3965 reads — 0 comments

How do I limit NIC usage for multicast in NDDS 3.1a?

Note: Applies to NDDS 3.x For machines with multiple NICs, it is sometimes useful to specify which NIC(s) to communicate over. Multicast packets will be sent through all interfaces that satisfy the following criteria: It is enabled for multicast NDDS is configured to use it Enabling a NIC for ...
sara
Thu, 01/17/2013 - 08:17
4496 reads — 0 comments

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