On Saturday 04 October 2008, Gary Fixler wrote: >I tried to send a message last night, but it never showed up on the list. I >have the worst time getting messages through. > >Basically, I'm on an aging Shuttle PC from 2002 with an Nvidia GeForce4 Ti >4600. When I start up latency-test, I'm in the single-digit thousands, like >6500 or so. If I play around online with Flash things (e.g. the Fantastic >Contraption game) it jumps to about 35k(ns) for the base thread jitter. If I >open glxgears it usually bumps up to 150k+, and if I maximize it, it soars >to well over 350k, sometimes almost 400k. The machine does feel laggy - slow >window redraws when dragging windows - but I'm also used to a much faster >machine now. > >I've searched linuxcnc and google, and read a bunch about latency, PLCs, >CAS, et al on Wikipedia, but it's just too much to absorb, and I can't >really find targeted debug steps to try. What have you guys done to diagnose >these problems. What are some steps I can try? The manual was pretty brief >about this. Unfortunately, I know absolutely nothing about things like >network adapters and BIOS whatnots. > >This is something that's been following me since the Dapper version. I've >just installed the 8.04 version, and it's quite pretty, but I can't get past >stage 1. Even the configuration wizard won't work right, because with all of >the values I'm getting, I can't even run the test buttons properly. The >motors step about once per second unless I lie heavily in my answers to >questions, like max accel and feed rates and such, and I still can't get it >to move well. > >Thanks for any help. I'd love more than anything to get this sorted. Lots of >projects lined up! >-Gary
I'm gonna play possum, and go out to the end of a persimmon branch and probably saw it off behind me here, but Does this shuttle have its nvidia video on the main board, sharing the system memory instead of using its own? If that is the case, then the first step is an offboard video card in either an AGP slot if it has one, or the first PCI slot. And FWIW, I have an older AGP GForce2 5200/256 nvidia in my machine, and latencies were terrible when using the nvidia binary, quite a bit better when using the nv module, and much much better when using the fallback if nothing else works 'vesa' driver. So that is what I'm using. To do that offboard video, you'll need to disable the onboard video in the bios. And steer clear of later nvidia cards, their soldering alloy and method virtually guarantees a failure within a year. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Life is a yo-yo, and mankind ties knots in the string. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
