| len-dt | Setting pci latency does help. I can get my d66 running at -p32 without xruns now. | 01:02 |
|---|---|---|
| len-dt | (with PA-jack bridging turned off) | 01:02 |
| len-dt | Nope. Not so good when I started putting sound through. | 04:50 |
| len-dt | A more conservative setting than http://wiki.linuxmusicians.com/doku.php?id=system_configuration suggests seems ok. This is of use only for older systems anyway. PCIe doesn't need it... and single slot pci doesn't either. Even my cheapy netbook is all PCIe internally. | 05:20 |
| len-dt | on another note, anyone know about the differences in midi interfaces? | 05:21 |
| len-dt | The old 401 midi boxes used their own internal clock to keep timing tight. The info sent to the computer was not just midi information, but also what time the event happened. It seems the new USB midi IFs just feed the midi info through as it comes and so the computer timing is very important. | 05:24 |
| len-dt | Does anyone know when this switch happened? | 05:29 |
| TheMuso | Do you mean MPU-401? | 05:36 |
| TheMuso | No idea about the switch, but I had a mobo that had an MPU-401 compatible MIDI chip on it, the mobo was from 2002/2003. | 05:37 |
| len-dt | Just reading about it and the 401 had two modes, normal and uart | 05:37 |
| len-dt | a lot of 401 "compatables" only suported uart mode. | 05:38 |
| len-dt | The story goes that modern computers can do ok with uart mode, but ailo was having timing problems with his USB IF where my old game port (ensoniq) is fine. | 05:40 |
| len-dt | The ensoniq is 401 compatible so that may be the reason. | 06:07 |
| === shnatsel is now known as SergeLion | ||
| === cyphermox_ is now known as cyphermox | ||
| len-dt | ailo, did some research on midi ports. Is your's "401 compatible"? | 21:51 |
| len-dt | It seems there are two kinds of midi ports. Uart and smart (mpu 401). My ensoniq game port says it is mpu401 compatible. | 21:54 |
| len-dt | They send not just the midi data but the time stamp of when it happened... actually how many clock ticks since the last event I think. So it doesn't matter if the card is serviced on time. | 21:55 |
| len-dt | The uart type relies on alsa to know what time the event happened. | 21:57 |
| len-dt | That may be why access to a high rez timer is important for USB/raw uart midi ports. | 21:57 |
| len-dt | ailo, I also tried the PCI latency script from the http://wiki.linuxmusicians.com/doku.php?id=system_configuration page | 21:58 |
| ailo | len-dt: Interesting. I haven't looked into that at all, other than I know alsa midi is no fun when using my external midi gear | 21:59 |
| len-dt | It actually makes things worse, It seemed good with just jack running, but when I started guitarix I had lots of problems. | 22:00 |
| len-dt | ailo, what I am saying to a point is that I will not be able to test if using high rez timers actually helps midi, because mine doesn't seem to need it. | 22:00 |
| len-dt | I have to run bye | 22:01 |
| ailo | I've had some difficulty putting time on US this last 1-2 weeks. Been really busy. Hopefully I can spare enough time to help finish the web site this week, but that will probably be difficult | 22:02 |
| ailo | Sunday is booked up at least. I'm cycling 170km :P | 22:03 |
| ailo | I have Friday and Saturday to get some work done | 22:04 |
| ailo | After that I can start working on the wiki, and help organize testing docs | 22:05 |
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