On 10-06-22 09:42 AM, Ralf Mardorf wrote: > Gustin Johnson wrote: >> On 10-06-21 08:42 AM, Daniel James wrote: >> >>> Hi Ralf, >>> >>> >>>>> FAIL >>>>> >>>> best latency was 1.29 ms >>>> worst latency was 7.00 ms, which is too much. >>>> >>> Thanks for running those tests, that's very helpful. >>> >>> I'd be interested to know if other users can 'pass' this test using our >>> current distros and kernels. If not, it seems like we have some more >>> tweaking to do :-) >>> >>> >> Those values are what you can expect with USB MIDI. If you have no >> choice but to use USB gear then try to minimize the number of USB >> devices that are in use. For example use PS/2 based HIDs (aka keyboard >> and mouse). Disconnect any other USB devices (such as printers and >> scanners). >> >> Even doing that I do not think that there is much room for improvement. >> >> In the next couple of days I will try and test my own rig with the RME >> and USB MIDI interfaces. > > It's the only USB device in use. Mouse and keyboard are PS/2 devices, my > printer isn't in use, but still a parallel port one and the USB stick is > just for temporarily backups and usually not connected. > > I did start a reply regarding to rtirq defaults for USB and I started an > experiment, but then my PATA hard disk failed and there is an issue with > GRUB for my SATA. > The limitations are with how USB actually works. It was not designed for low latency responsiveness. Messing with IRQs is going to be enough. You might see some improvement, but not enough to make a difference.
> I wasted my whole day with trying to repair GRUB for the SATA, but it > didn't work. > Then I tried to run a live cd, to get access to the internet, but there > is no new live cd with PPPoE and a lot of old live cds didn't run on my > computer or didn't support PPPoE too. > If GRUB was installed on the PATA, you will need to install it into your SATA drive. The difficulty will scale with the number of hard drives and OSs that you have installed. I know that your system can be rescued. Most rescue distros have the option to boot an OS off of your hard drive. The one I use and love is systemrescuecd, though it is very much CLI orientated. > Now I run the Ubuntu 7.10 live cd from a German magazine from 2008, it > ships with pppoeconf. > > Fazit: At the moment I don't have access to the ALSA MIDI latency > packages and I can't run 64 Studio 3.0 beta and 3.3 alpha, both are on > the broken PATA. > > Tomorrow, perhaps tonight, I'll try to get access to my SATA, resp. to > Suse 11.2. I don't have the time to do it now. > > Hopefully my PATA will start just one time again, to get it completely > up-to-date backuped, at the moment it's disconnected to nurse it. > What exactly is wrong with it? If you cannot mount it from a live CD, then the drive is probably toast. Hth,
signature.asc
Description: OpenPGP digital signature
_______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
