Installing Uspace for Master

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16 Nov 2016 11:49 #82859 by rodw
Replied by rodw on topic Installing Uspace for Master
Wow!, I knew the letency was going to get worse but this is crazy!

On Wheezy 2.7 running master
Base Thread 22,591

On Wheezy Premptive running Master
Base Thread 285,934

I think that means I need to get a new PC. The current one is a MiniITX Via C7 running at 1.5GHz with an 8 gb SSD and in an industrial case.

I have no idea what M/B to buy these days as I've not built a PC for over 10 years.

I know PCW suggested a couple of PC's recently so I'll see what I can find down under

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16 Nov 2016 13:23 #82860 by Todd Zuercher
The Preempt-RT kernels seem to be much more dependent on the horsepower of the CPU than the RTAI ones. An RTAI setup can work quite nicely on an old P4 or Atom cpu, but not so much for Preempt-RT.

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16 Nov 2016 21:05 #82872 by rodw
Replied by rodw on topic Installing Uspace for Master
Todd, Thanks,

I can find this board you suggested on this thread recently
forum.linuxcnc.org/38-general-linuxcnc-q...good-usff-pc-s#79536

But 2 network interfaces would be nicer so I wondered if a
Jetway NF9U-2930 Intel Celeron motherboard would be OK
www.mini-box.com.au/Jetway%20NF9U-2930%2...%20motherboard.html#

I found some benchmark comparisons that said there was not much between them. Any thoughts?

I do like the ZOTAC ZBOX C Series CI323 PCW suggested but its not available down under

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16 Nov 2016 21:38 #82876 by Todd Zuercher
Would probably be fine, but it seems a bit spendy. The other board plus an Ethernet card might be cheaper.

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16 Nov 2016 21:43 #82877 by rodw
Replied by rodw on topic Installing Uspace for Master

Would probably be fine, but it seems a bit spendy. The other board plus an Ethernet card might be cheaper.


Yes, cost was noted. I found out Newegg does ship down here so I might get the complete unit PCW talked about yet.

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17 Nov 2016 12:42 #82889 by rodw
Replied by rodw on topic Installing Uspace for Master

I found out Newegg does ship down here so I might get the complete unit PCW talked about yet.


NewEgg's AU site does not stock the PC but I've found a NF9U-2930 Intel Celeron motherboard with dual NIC's so I think I will go with that.

How much RAM should I get for it?

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17 Nov 2016 13:35 #82895 by Todd Zuercher
2g is usually sufficient, more than 4 is probably overkill.
The following user(s) said Thank You: rodw

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18 Nov 2016 11:24 #82955 by rodw
Replied by rodw on topic Installing Uspace for Master
Well I think I've decided on one of the UFF PC's that PCW suggested even if its only got one Network card. Some people that run online stores just don't want to respond to a customer ready to buy so I'm going to one of my favourite local PC stores.

Peter suggested a Dual NIC Zotac with a Intel Celeron N3150 as well as a single NIC GigaByte Brix

The one I found is Gigabyte Brix with a Celeron J3160 which from all accounts is much the same as the N3150
www.computeralliance.com.au/gigabyte-bri...with-gigabit-network

I'm planning to grab one of these in the morning unless someone tells me I'm crazy rather than stuff around ordering stuff online.

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20 Nov 2016 11:07 - 20 Nov 2016 11:08 #83028 by rodw
Replied by rodw on topic Installing Uspace for Master
Well, I have made some progress but still not out of the woods yet.

I purchased a Gigabyte Brix GB-BACE-3160 yesterday. It has a Celeron Brasswell J3160 cpu which is an update of the Zotec with a N3150 CPU that PCW recommended.


The builtin WiFi uses a rtl8821ae chipset which has no drivers for Linux but I was not too worried about that becasue PCW said they usually caused latency anyway. The builtin Bluetooth just worked....

I had a lot of trouble getting my ASUS USB-N10 NANO installed on the Pre-emptive platform but eventually found a way

I am a bit disappointed with latency and tried every BIOS setting but the best I can get is
Servo Thread 48934
Base Thread 49053

Also, I have not got the Mese 7i76e up and running yet.
I can ping the Mesa 7i76e on the default eeprom Ip address of 10.10.10.10

My home network usas the 192.168.1.0 address range. On my 32 bit PC, I was able to run pncconf and LCNC it errored with an invalid IP address until I updated one of the config files. . This time I did not get as far and LCNC is reporting the following error in the debug window before it ever complained about the Ip address.
[b]Debug file information:[/b]
Note: Using POSIX realtime
hm2_pci: rtapi_app_main: No such device (-19)
./my_LinuxCNC_machine.hal:8: waitpid failed /usr/bin/rtapi_app hm2_pci
./my_LinuxCNC_machine.hal:8: /usr/bin/rtapi_app exited without becoming ready
./my_LinuxCNC_machine.hal:8: insmod for hm2_pci failed, returned -1

So I guess I have 2 questions:
1. Is there anything I can do to improve system latency?
2. Whats going on with pcconf and how to I resolve the error?
Last edit: 20 Nov 2016 11:08 by rodw.

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20 Nov 2016 12:32 - 20 Nov 2016 12:32 #83034 by andypugh
You shouldn't be using hm2_pci, you need to use hm2_eth
Last edit: 20 Nov 2016 12:32 by andypugh.

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