On Sun, 2010-07-11 at 17:21 +0200, Arnout Engelen wrote: > On Sun, Jul 11, 2010 at 04:53:14PM +0200, Ralf Mardorf wrote: > > today I compared a default Ubuntu Studio with and without the > > proprietary NVIDIA driver. > > OK, so the proprietary driver seems to yield better 'worst latency' values > compared to nouveau. That's kind of odd, anything X-related would have a much > lower priority than the MIDI threads. > > > Note that for Ubuntu Studio 2 tests failed because of time out errors > > What exactly timed out?
There was a time out message by the alsa-midi-latency-test. It started and than it asked, if there still is a connection, while there still was a connection. > > > even the tests that were passed with success are significantly less good, > > than the tests with openSUSE, were I set up audio myself. > > > > What might be the difference between Ubuntu and Suse? > > > ------------------------------------------------------------------------ > > Ubuntu Studio 10.04 amd64 > > 2 x Terratec EWX 24/96 (2 single cards, but 1 virtual card) > > Frequency scaling ? > > ------------------------------------------------------------------------ > > spinymo...@ubuntu:~$ uname -a > > Linux ubuntu 2.6.32-23-preempt #37-Ubuntu SMP PREEMPT Fri Jun 11 > > 10:19:07 UTC 2010 x86_64 GNU/Linux > > spinymo...@ubuntu:~$ envy24control > > 0xcf00, irq 20, Master Clock int 44100 > > > ------------------------------------------------------------------------ > > openSUSE 11.2 amd64 > > 2 x Terratec EWX 24/96 (2 single cards, but 1 virtual card) > > Frequency scaling performance > > ------------------------------------------------------------------------ > > spinymouse1...@suse11-2:~> uname -a > > Linux suse11-2 2.6.31.6-rt19 #1 SMP PREEMPT RT Wed Nov 18 16:59:26 CET > > 2009 x86_64 x86_64 x86_64 GNU/Linux > > 2 differences jump out: > > - the frequency scaling is set to 'performance' on your suse install and to > '?' on your ubuntu install. Yes, I assume that an audio distro won't start with ondemand by default, I'll run hwinfo to see the scaling next time. For Ubuntu Studio there are a lot of issues that are nwe to me, no xorg.conf, no menu.lst etc.. > - The kernel options for your suse install has the options 'SMP PREEMPT RT', > while your ubuntu install has the options 'SMP PREEMPT'. In other words, it > looks like your ubuntu kernel has 'normal' preemption, but not the -rt > patch. I didn't noticed that, you're right. The Suse kernel is self build, the Ubuntu Studio kernel is from the repositories. > The latter looks like a good candidate for explaining the difference. Could > you test with the kernel from the linux-image-2.6.31-10-rt package instead of > the kernel from the linux-image-2.6.32-21-preempt package which you seem to be > using now? Thank you, a good idea, before I'll build a kernel by myself, it would take around 50 minutes, I'll install this kernel from the repository. To be continued. Ralf > > > Kind regards, > > Arnout _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
