Preface:
Xenomai 2.6
Vanilla kernel 3.8.13 i686
RTnet 0.9.13
I have two PCs (M and S) connected via Ethernet exclusively for RTnet use.
M--[switch]---S
M's NIC is driven by the rt_r8169 driver
S's NIC by the rt_e1000 driver
The problem is that the connection is unstable and about 80% of the
packets get lost.
root@machinectrl:~# rtping 192.168.0.1
Real-time PING 192.168.0.1 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 time=111.2 us
64 bytes from 192.168.0.1: icmp_seq=7 time=99.2 us
64 bytes from 192.168.0.1: icmp_seq=13 time=99.1 us
64 bytes from 192.168.0.1: icmp_seq=23 time=100.5 us
64 bytes from 192.168.0.1: icmp_seq=24 time=97.5 us
64 bytes from 192.168.0.1: icmp_seq=30 time=104.8 us
64 bytes from 192.168.0.1: icmp_seq=32 time=101.8 us
64 bytes from 192.168.0.1: icmp_seq=34 time=102.1 us
64 bytes from 192.168.0.1: icmp_seq=35 time=101.4 us
64 bytes from 192.168.0.1: icmp_seq=37 time=101.5 us
64 bytes from 192.168.0.1: icmp_seq=38 time=99.7 us
64 bytes from 192.168.0.1: icmp_seq=43 time=99.2 us
64 bytes from 192.168.0.1: icmp_seq=54 time=101.3 us
64 bytes from 192.168.0.1: icmp_seq=60 time=102.2 us
64 bytes from 192.168.0.1: icmp_seq=63 time=97.3 us
64 bytes from 192.168.0.1: icmp_seq=69 time=100.3 us
64 bytes from 192.168.0.1: icmp_seq=80 time=101.2 us
64 bytes from 192.168.0.1: icmp_seq=84 time=100.7 us
64 bytes from 192.168.0.1: icmp_seq=86 time=103.4 us
64 bytes from 192.168.0.1: icmp_seq=88 time=105.1 us
64 bytes from 192.168.0.1: icmp_seq=89 time=101.2 us
64 bytes from 192.168.0.1: icmp_seq=96 time=100.7 us
64 bytes from 192.168.0.1: icmp_seq=98 time=99.2 us
64 bytes from 192.168.0.1: icmp_seq=99 time=103.2 us
64 bytes from 192.168.0.1: icmp_seq=113 time=98.8 us
64 bytes from 192.168.0.1: icmp_seq=116 time=105.7 us
64 bytes from 192.168.0.1: icmp_seq=119 time=111.2 us
64 bytes from 192.168.0.1: icmp_seq=126 time=101.7 us
64 bytes from 192.168.0.1: icmp_seq=130 time=102.6 us
^C
--- 192.168.0.1 rtping statistics ---
135 packets transmitted, 29 received, 79% packet loss
worst case rtt = 111.2 us
This happens sometimes from the start after both machines are booted
without prior communication.
If it is not broken from the start the RTnet works as expected.
But it also happens after the system is running for several hours
without any noticeable user action that would cause it.
The cables and connectors have all been double checked.
Is this a know error or is there anything you can tell me about this
pattern?
I'm grateful for every piece of advice as always.
Cheers,
Johannes
