Re: [Emc-users] Good latency results

[andy pugh]

On 7 January 2012 09:59, Alastair D'Silva  wrote:

> If someone could point me to how to add this to the wiki, it would be
> appreciated.

The page is here:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Latency-Test

You may see a small link at the bottom "edit text of this page" but if
you don't then you would need to follow the instructions here:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?BasicSteps


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[Emc-users] Good latency results

[Alastair D'Silva]

I recently built a new (very cheap) machine to control my laser engraver,
and got particularly good results, so I thought I'd share what I did with
the community:

These are the results from running the latency test for 10 hours, with
Firefox, glxgears & glxhead running in the background:

Max Interval (ns)   Max Jitter (ns)
Servo Thread992204  4364
Base Thread 29631   4935

CPU: Intel G530 Celeron, dual core, not HT, 2MB cache, 2.4GHz
Motherboard: Asrock H61M-HVS
RAM: 2x2GB sticks
Video: ATI Radeon 2400 (using the default "radeon" driver, as I got better
results than "fbdev")
LAN: USB Wifi

Bios config:
OC Tweaker
CPU Ratio   Auto
Intel SpeedStep Disabled

Advanced
CPU Configuration
Active Processor Cores  All
Enhanced Halt State C1E Disabled
CPU C3 State SupportDisabled
CPU C6 State SupportDisabled
Package C State Support Disabled

North Bridge Configuration
IGPU multimonitor   Disabled

South Bridge Configuration
Onboard HD AudioDisabled
Onboard LAN Disabled

ACPI Configuration
Suspend to RAM  Disabled
ACPI HPET Table Disabled

USB Configuration
Legacy USB Support  UEFI Setup Only


I set isolcpus=1 as a kernel option, as this is a dual core CPU:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TroubleShooting#The_isolcpus_Boo
t_parameter

I then played with onboard (oncpu?) video, and got the following (slightly
worse) results after an hour:
Max Interval (ns)   Max Jitter (ns)
Servo Thread993478  5638
Base Thread 31612   7159


If someone could point me to how to add this to the wiki, it would be
appreciated.

-- 
Alastair D'Silva   mob: 0423 762 819
twitter: evildeece   msn: alast...@d-silva.org
blog: http://alastair.d-silva.org




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