Re: [RTnet-users] Re: RTmac client problems

[Shibu V. <vs...@cs...>]

Hey Jan,

Please see below:

On Thu, 13 Nov 2003, Jan Kiszka wrote:

> Shibu Vachery schrieb:
> >
> > Though using the tdma_debug=10 gave me this information:
> >
> > This looks suspicious as the test ack shows nearly 2 secs for rtt, whereas
> > on ethereal I notice that the client(192.168.0.3)  has replied within 10us
> > of receiving the "TDMA Request Test" with a "TDMA Acknowledge Test"
> >
> > I'm pasting a snippet of the dmesg output at the master(192.168.0.1)
> >
> > RTmac: tdma: tdma_task_config() sending test packet #332 to 192.168.0.3
> > RTmac: tdma: tdma_do_event() event=ACK_TEST, state=TDMA_MASTER_SENT_CONF
> > RTmac: tdma: tdma_master_rcvd_test_ack() received test ack packet
> > RTMAC: tdma: tdma_master_rcvd_test_ack() received test ack from
> > 192.168.0.3 rtt 2935505755 ns
> > RTmac: tdma: tdma_task_config() shutdown complete
> > RTmac: tdma: tdma_timer_start_sent_test() timer set
> > RTmac: tdma: timer set, now=34920626, timeout=34920726
> > RTmac: tdma: next state=TDMA_MASTER_SENT_TEST
> > RTmac: tdma: tdma_timer_expired_sent_test() timer expired
> > RTmac: tdma: tdma_do_event() event=EXPIRED_MASTER_SENT_TEST,
> > state=TDMA_MASTER_SENT_TEST
> > RTmac: tdma: station 1, IP 192.168.0.3, max rtt 4291506 us
> > RTmac: tdma: tdma_make_station_list() sorted: station 1, IP 192.168.0.3,
> > rtt -3461633 us
> > RTmac: tdma: tdma_timer_start_task_change() timer set
> > RTmac: tdma: timer set, now=34920726, timeout=34920826
> > RTmac: tdma: tdma_task_change_con() succsessfull
> > RTmac: tdma: tdma_do_event() event=CHANGE_OFFSET,
> > state=TDMA_MASTER_SENT_TEST
> >
>
> This looks very suspicious. According to your Ethereal screen shot, your
> master seems to run with the correct period. Maybe there is a problem
> with the timer on the client. Could you copy+paste that output, too? You
> may also try to check the setup communication between master and client
> with Ethereal. Normally, 1000 test packets are exchanged, but here it
> seems that this procedures fails earlier. I hope it is not a problem
> with the 3COM card, as we were not able to test that device.
>
> Jan
>


I loaded rtmac on the client with the tdma_debug=10 option.

The client has only the following line appearing continuously in the dmesg
output:

RTmac: tdma: tdma_do_event() event=START_OF_FRAME, state=TDMA_CLIENT_RCVD_ACK


>
>