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 Thread 992204 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 Support Disabled
CPU C6 State Support Disabled
Package C State Support Disabled
North Bridge Configuration
IGPU multimonitor Disabled
South Bridge Configuration
Onboard HD Audio Disabled
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 Thread 993478 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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