Audio/Video Problems
Mark Greenwood
fatgerman at gmail.com
Thu Jan 3 18:30:12 UTC 2013
On 3 Jan 2013, at 18:20, Gene Heskett wrote:
>
> I guess what I wanted to say was that for some uses, the latest and
> greatest, because its real world performance sucks dead toads thru soda
> straws, is a disaster.
Couldn't agree more Gene :) I use Linux for music production (occasionally) and need hard real-time performance. Things have been getting steadily worse since 10.10 and the latest release is completely useless to me. (Audio latency minimum I can get is 200ms, as opposed to 5ms with 10.10).
However I don't think (K)Ubuntu are to blame for this, it's entirely in the hands of the kernel developers and Linus himself has no interest in realtime.
Mark
> You simply cannot move a machine capable of moving
> a flood cooled cutting tool spinning 20k rpms through alu or steel in terms
> of meters per minute, without being able to sample its position, do the
> math and issue corrective orders at millisecond or faster rates for servo
> controls, or to stepper motors at a minimum of 40,000/sec with software
> step generation. External stepper generators can take that maximum rate to
> over a megacycle, but then of coarse its no longer a 100% LinuxCNC
> solution, needing additional hardware that can run $1000/axis controlled.
>
> Cheers, Gene
> --
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