[Emc-users] Difficulty defining jitter, was Re: May be of Interest

2012-04-01 Thread Kent A. Reed
On 3/31/2012 4:45 PM, Kirk Wallace wrote: I found this: http://www.bitmuster.org/projects/emc.html the thing that comes to mind, considering the rev date, how it seems fairly significant, and recent questions on the list, it's a little surprising that this hasn't hit the wiki or been on the

Re: [Emc-users] Difficulty defining jitter, was Re: May be of Interest

2012-04-01 Thread Jon Elson
Kent A. Reed wrote: With a preempt_RT enabled kernel 2.6.33.7.2-rt30 and an appropriately modified EMC2.4.4 [patches from Michael Büsch and Jeff Eppler] running on an IBM Thinkpad T40 with a 1500MHz PentiumM cpu, the author measured the following: - 1) the EMC2 latency-test Servo

Re: [Emc-users] Difficulty defining jitter, was Re: May be of Interest

2012-04-01 Thread Kent A. Reed
On 4/1/2012 2:03 PM, Jon Elson wrote: Kent A. Reed wrote: With a preempt_RT enabled kernel 2.6.33.7.2-rt30 and an appropriately modified EMC2.4.4 [patches from Michael Büsch and Jeff Eppler] running on an IBM Thinkpad T40 with a 1500MHz PentiumM cpu, the author measured the following: -

Re: [Emc-users] Difficulty defining jitter, was Re: May be of Interest

2012-04-01 Thread Jon Elson
Kent A. Reed wrote: As an aside, it was interesting to me that while the author of the bitmuster article made note of the fact that different tools reported different numbers, he/she seemed indifferent to the actual numbers reported. Uhhh, why bother making a measurement if you have no

Re: [Emc-users] Difficulty defining jitter, was Re: May be of Interest

2012-04-01 Thread Jack Coats
On Sun, Apr 1, 2012 at 6:15 PM, Jon Elson el...@pico-systems.com wrote: Kent A. Reed wrote: As an aside, it was interesting to me that while the author of the bitmuster article made note of the fact that different tools reported different numbers, he/she seemed indifferent to the actual