On Wed, 2010-06-23 at 15:40 -0600, Gustin Johnson wrote: > 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.
Yep :(. > > 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. 101% ACK regarding to the systemrescuecd, it's my favourite too :), but it failed. I guess there's something esoterically for Suse, because I could solve it using the Suse install DVD. While everything was ok for 64 Studio 2.1, after using an Ubuntu live cd, the same way I would have used a systemrescuecd (with one difference, for the Ubuntu CD I had PPPoE, but not for the systemrescuecd). > > 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. The drive is absolutely 'toast' (I guess I translated 'toast' correctly ;). 'Click-click' ;) ... > Gene Heskett about how to handle a hard disk drive: > > > One could also use a hammer > > with plastic faces in case the hand bruises easily. ;-) > > > Quoted out of context ... I'm laughing out loud. But you're right, > I've got nothing to lose. Thank you. The HD is 4 years old and I do a startup several times a day. Not good for the HDs, but the power bill vs the costs of a HD ;). I wasn't surprised when it was broken and for any HD >= 2years I do backups very often ;). Anyway, Gene's idea is very cool. It will take around 7 days and I'm back to 64 Studio 3.0 and 3.3 ;) ... with a loss of 3 days regarding to the systems backups, but just 1 day regarding to a thunderbird backup. And again, full ACK regarding to the systemrescuecd, it fix everything regarding to DEB Linuxes, but not to Suse, while Suse 64-bit has got advantages regarding to 32-bit apps. I guess for the future I'll prefer DEB @ 32-bit :D, resp. 64 Studio 4.0 i369 ;). Cheers! Ralf
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