在 2008-03-15六的 09:16 +0100，Jan Kiszka写道： > Hi Lily, > > please keep the list in CC on reply. > > Li, Chanjuan wrote: > > 在 2008-03-14五的 21:05 +0100，Jan Kiszka写道： > >> Li, Chanjuan wrote: > >>> hi,all: > >>> I install rtnet on top of rtai-3.5, kernel 2.6.17. I run an example of > >>> rtai(simpleclient/simpleserver) for several times. > >>> after that, I want to stop rtnet and it stalled that is rtnet can not use > >>> but the system can work. > >>> I lsmod to check, I found rtipv4 and rtnet modules are still there. I > >>> use rmmod to remove rtipv4 modules, there appeare" > >>> modules is in use and busy". what's the problem? > >> This means that some internal resource of RTnet was not properly > >> released. Please provide the related kernel log (e.g. via dmesg). Did > >> you used the latest version of RTnet (0.9.10-rc2)? > >> > >> Jan > > I figure out what happend.yes, the interanl resource of RTnet was not > > released due to I run while(1) loop. > > Hmm, I do not yet understand what you mean. Starting and terminating > some RTnet application even a million times should not lead to the core > loosing resources and blocking on unload. sorry, I did not explain clearly. In server side, I run while(1) loop for send and recv message which results in permanant using rtnet resource, so it can not be released.
> > there is another question on tdma configuration. I am not clear the > > tdma.conf. I make an example to state my understanding. > > I write a simple tdma.conf as follows: > > ############################ > > master: > > cycle 500 > > ip 192.168.1.25 > > slot 0 0 > > slot 1 300 1/2 > > > > slave A: > > ip 192.168.1.26 > > slot 0 100 > > slot 1 300 2/2 > > ############################## > > I think the config file means time slot like this: > > 0 ~ 100 : master for RT traffic > > 100~200 : slave A for RT traffic > > 200~500 : for master and slave with NRT traffic > > ________ ________ _________ > > |master | slave A|master | > > | RT | RT |NRT | > > | | |---------| > > | slot 0 | slot 0 |slave NRT| > > ----------------------------- > > 0 100 200 > > > > is it right or not? > > Yep. As you correctly visualized, the third slot is alternated between > the master and the slave. > > Note that the actual slot length depend on the maximum packet size for > the slots. As you didn't specify any, TDMA will allow what Ethernet is > able to transmit: 1500 byte payload. In this case, the frame itself can > already take ~122 us (on 100 MBit/s), and you have to account for > transmission jitters. However, if your RT applications on master and > slave do not use the full length, then you can be fine with this config. Now, I make a experiment to test performance of rtnet. I just use two nodes and do ping-pong to test round-trip time on the top of rtai. the result indicat that the round-trip time is almost two tdma cycles no matter of packet size,except the packet size around 1500. Is it reasonable? I think it can reduce to one cycle if I deploy tdma config properly. I use the tdma config as above. Is it possible? Thanks very much! lily > Jan > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
