Excerpts from Gene Heskett's message of 2010-06-17 00:45:14 +0200: > On Wednesday 16 June 2010, Patrick Shirkey wrote: > >On 06/17/2010 04:52 AM, Ralf Mardorf wrote: > >> Paul Davis wrote: > >>> On Wed, Jun 16, 2010 at 2:30 PM, Ralf Mardorf > >>> > >>> <[email protected]> wrote: > >>>> PS: Why not programming for savant syndrome musical gifted and 'fast' > >>>> watching people too? > >>> > >>> the limits under discussion relate to monitor technology, not human > >>> capabilities. > >> > >> I'm not a 'fast watching savant' ;) and even if the GUI is too slow, I > >> won't care. I'm listening to music with my very good ears, but my bad > >> eyes. No doubt, Linux is a good choice, but MIDI real-time could be > >> better. For me the GUI is unimportant. BUT I prefer to do audio > >> recordings using Linux, but MIDI recordings. It's a real pity, because > >> MIDI would add some very cool features. > > > >This is only on your system right? I know a lot of people are working > >with midi recording using linux tools. > > > >You see jitter at low latency but have you tried changing your hardware > >or working with the driver developers to isolate and fix the bugs you > >are seeing? > > One of the test tools that might be enlightening for the MIDI folks here, is > the machine control program called emc. Because jitter is very important > when feeding a stepper motor controller a steady heartbeat at high audio and > somewhat above frequencies, the coders have developed a 'latency-test' > script, which you run on one screen, then abuse the heck out of the machine > doing other things, (browsing the web, moving windows around, compiling a > kernel, whatever warms up the cpu) then come back half an hour or more later > and read the average and worst case latencies as displayed in nanoseconds. > > Those are generally big figures so do the math and make milliseconds out of > them. > > Emc when running stepper motors is fussier that all get out, and that tool > just might point the finger at truly bad motherboard, or video hardware. > FWIW, an nvida video card, can only be used in a machine running emc if the > vesa driver is selected, all the others including nv, tie up the interrupts, > sometimes for many milliseconds. For emc, that would equal a stalled motor > and a wrecked part you were cutting at the time it stalled. Similar things > can be said about the APCI of some motherboards. If that can't be fixed via > a bios setting, toss the board. Via chipsets seem to be the most popular in > this latter category. > > If its a complex part that you've already got several hours worth of carving > & cutting tool wear into, that will only happen once, because whatever the > culprit is, gets both found and a free airmail trip into the bin. > > What? Oh, I'll go back to lurking now. ;-) > > -- > 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) > The policy is not to have policy. It works as well in kernel design as > politics. > > - Alan Cox on linux-kernel
I fear something named simply 'emc' isn't easy to find around the net. -- Regards, Philipp -- "Wir stehen selbst enttäuscht und sehn betroffen / Den Vorhang zu und alle Fragen offen." Bertolt Brecht, Der gute Mensch von Sezuan _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
