On Thursday 03 January 2013 17:23:34 Kent A. Reed wrote:
> Hi, Joachim. I'm the KAR. I've traced my crashes to the way my
> BeagleBone and DHCP server are interacting. I'm not sure yet what the
> root cause is but I am sure it's not in Michael's
> LinuxCNC/Xenomai/Ubuntu system since the same occurs when I network-boot
> a Ubuntu Quantal system from the same server. It does not happen when I
> boot /load everything directly from microSD card.
>
> When you say "after several reboots" do you mean your crashes go away?
Yes.
Now I use this recipe:
- boot to the prompt on ttyO0
- login
- sudo reboot
- login on ttySO0
- for i in {1..10000}; do uptime; sleep 1; done;
- login from ssh and sudo service apache2 stop (necessary?)
- wait for about 4min until uptime responds with 6min
- start linuxcnc which gives an error about connecting to xserver
- on my desktop: xhost +192.168.1.90
- start linuxcnc again (with success)
Yesterday linuxcnc runns for >4h.
There are another points at cold start.
Sometimes dhcp is not working if the kernel wants to know the ip.
The dhcp server is responding (from tcpdump). At bootp time dhcp works.
Sometimes there are problems with the root files system:
(now 192.168.1.26 is the tftp server)
[ 69.646849] nfs: server 192.168.1.26 not responding, still trying
[ 69.653326] nfs: server 192.168.1.26 not responding, still trying
[ 99.686819] nfs: server 192.168.1.26 not responding, still trying
[ 99.693283] nfs: server 192.168.1.26 not responding, still trying
[ 104.707039] nfs: server 192.168.1.26 OK
[ 104.711201] nfs: server 192.168.1.26 OK
[ 104.715447] nfs: server 192.168.1.26 OK
[ 104.719587] nfs: server 192.168.1.26 OK
[ 144.166695] nfs: server 192.168.1.26 not responding, still trying
[ 144.173160] nfs: server 192.168.1.26 not responding, still trying
[ 144.180336] nfs: server 192.168.1.26 OK
[ 144.184448] nfs: server 192.168.1.26 OK
[ 176.806554] nfs: server 192.168.1.26 not responding, still trying
[ 176.813015] nfs: server 192.168.1.26 not responding, still trying
[ 176.819490] nfs: server 192.168.1.26 not responding, still trying
I see allways:
rpcbind: Cannot open '/run/rpcbind/rpcbind.xdr' file for reading, errno 2 (No
such file or directory)
rpcbind: Cannot open '/run/rpcbind/portmap.xdr' file for reading, errno 2 (No
such file or directory)
Because /run is generated on the fly, somewhere this files must be touched.
and I am confused about changes in cpu load:
05:10:57 up 5 min, 1 user, load average: 0.20, 0.31, 0.16
05:10:58 up 5 min, 1 user, load average: 0.20, 0.31, 0.16
05:10:59 up 5 min, 1 user, load average: 0.20, 0.31, 0.16
05:11:00 up 5 min, 1 user, load average: 0.20, 0.31, 0.16
05:11:01 up 5 min, 1 user, load average: 0.26, 0.32, 0.17
some lines deleted
05:11:27 up 5 min, 1 user, load average: 0.31, 0.33, 0.17
05:11:28 up 5 min, 1 user, load average: 0.31, 0.33, 0.17
some lines deleted
05:12:25 up 6 min, 1 user, load average: 0.12, 0.27, 0.16
05:12:26 up 6 min, 1 user, load average: 0.11, 0.27, 0.16
some lines deleted
05:13:47 up 7 min, 1 user, load average: 0.35, 0.30, 0.18
05:13:48 up 7 min, 1 user, load average: 0.35, 0.30, 0.18
some lines deleted
05:15:26 up 9 min, 1 user, load average: 0.81, 0.42, 0.23
05:15:27 up 9 min, 1 user, load average: 0.83, 0.43, 0.23
05:15:28 up 9 min, 1 user, load average: 0.83, 0.43, 0.23
If linuxcnc is running I see with top:
(my bb is powered from usb)
axis 50%
milltask 30%
10% idle
1.2Mb/s from bb to desktop xserver communication.
Summary:
I am very happy with this dhcp/bootp setup.
My suggestion: keep it.
Joachim
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