Latency mesage SOLVED !
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22 Aug 2020 08:53 #178986
by macsddau@linuxcnc
Replied by macsddau@linuxcnc on topic Latency mesage
Get the latency message 
Running latency test again without any change.
Running latency test again without any change.
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22 Aug 2020 11:26 #178988
by tommylight
Replied by tommylight on topic Latency mesage
Raise the Base_period in the ini file a bit then test again. Raise it until you do not get any latency warnings for at least an hour or two.
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22 Aug 2020 12:50 #178991
by macsddau@linuxcnc
Replied by macsddau@linuxcnc on topic Latency mesage
This morning. I run test. I get over 400ms while I was running full update with sympatic manager (some linuxcnc packages are not available). I suppose that very bad time was caused by the update. I reset test. Before that it was about 25.5ms.
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22 Aug 2020 12:58 #178992
by tommylight
Replied by tommylight on topic Latency mesage
uname -a ?
What PC ?
How much memory ?
What PC ?
How much memory ?
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22 Aug 2020 16:24 #179011
by macsddau@linuxcnc
Assembled 1U 19" PC:
ASRock J3355B-ITX, 1 G-Skill SO-DIMM 4Gb DDR3L 1333 CL9 RAM, WD GREEN 120Gb SDD, Radeon HD6450 Graphic card
OS :
What surprise me is that since I made some change on the settings, Jitter is pretty good for a while, but sometimes I get some inexplicable values.
Replied by macsddau@linuxcnc on topic Latency mesage
uname -a ?J
What PC ?
How much memory ?
Assembled 1U 19" PC:
ASRock J3355B-ITX, 1 G-Skill SO-DIMM 4Gb DDR3L 1333 CL9 RAM, WD GREEN 120Gb SDD, Radeon HD6450 Graphic card
OS :
Linux R883CNC 4.9.0-8-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.110-3+deb9u6 (2018-10-08) x86_64 GNU/LinuxWhat surprise me is that since I made some change on the settings, Jitter is pretty good for a while, but sometimes I get some inexplicable values.
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22 Aug 2020 16:54 #179014
by macsddau@linuxcnc
Replied by macsddau@linuxcnc on topic Latency mesage
After system update
Linux R883CNC 4.9.0-13-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.228-1 (2020-07-05) x86_64 GNU/LinuxPlease Log in or Create an account to join the conversation.
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22 Aug 2020 20:37 #179028
by tommylight
Replied by tommylight on topic Latency mesage
Did you disable everything regarding power saving, speed step, hyperthreading, etc in BIOS?
Most probably you would get much better latency with RTAI kernel on that board.
Most probably you would get much better latency with RTAI kernel on that board.
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23 Aug 2020 17:05 #179118
by macsddau@linuxcnc
www.linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso
Replied by macsddau@linuxcnc on topic Latency mesage
Is this the good link to start with RTAI ?Most probably you would get much better latency with RTAI kernel on that board.
www.linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso
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23 Aug 2020 17:52 #179124
by tommylight
But if you have a simple machine, please do give it a try, it should work as is and has a much lower latency on older PC's.
Replied by tommylight on topic Latency mesage
Yes, but it is to old so there are no updates or support or well anything, as you can not install anything any more in it.Is this the good link to start with RTAI ?
www.linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso
But if you have a simple machine, please do give it a try, it should work as is and has a much lower latency on older PC's.
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24 Aug 2020 17:12 #179257
by Todd Zuercher
Replied by Todd Zuercher on topic Latency mesage
If you want to leap through some hoops I think you can still force the old Wheezy version to install some software. You have to update the Debian repos to point to the Debian archives (google it), then fool the computer into thinking the date is before 2020 by setting the computer's date/clock back in time, install the software (using apg-get or synaptic) then reset your date/time correctly. (I think I pulled this off once, but it was a while ago.)
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