Re: [Emc-users] latency excursions

[Peter C. Wallace]

On Sun, 23 Jul 2017, dave wrote:

Date: Sun, 23 Jul 2017 08:48:19 -0700
From: dave <dengv...@charter.net>
Reply-To: "Enhanced Machine Controller (EMC)"
    <emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: [Emc-users] latency excursions
dave@linuxcnc:~$ uname -a
Linux linuxcnc 3.4-9-rtai-686-pae #1 SMP PREEMPT Debian 3.4.55-4linuxcnc i686 
i686 i386 GNU/Linux

task: 103857488 cycles, min=0.000049, max=0.474214, avg=0.010993, 86 latency 
excursions (> 10x expected cycle time of 0.010000s)

task: 25439189 cycles, min=0.000049, max=0.205898, avg=0.010989, 17 latency 
excursions (> 10x expected cycle time of 0.010000s)

I've done nothing to tune this cpu and as far as I can tell the motion is ok.

Still it leave me uncomfortable.

What do I need to change to clean this uo?


TIA

Dave

These are not real-time latency issues but rather delays in task
so are not a actual problem unless they are so long that they cause
a disruption the the non-real time tasks linuxCNC is doing (user interface 
etc)

These delays will not be reduced by any real time latency tuning of the system 
( and may well be made worse by things that slow the userland performance like 
isocpus )


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Peter Wallace
Mesa Electronics

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