There's still an issue with the latest Kernel and my NVIDIA, but on Tuesday I should be able to compare my USB's to my PCI card's MIDI. I guess @jackuser - nice -10 for rt has got no impact. I'm thinking to run the ALSA MIDI latency test without and with hrtimer (hpet) and without and with glxgears running.
On Sat, 2010-07-03 at 09:12 -0700, Niels Mayer wrote: > 2010/7/3 Ralf Mardorf <ralf.mard...@alice-dsl.net>: > > On Fri, 2010-07-02 at 14:51 -0700, Niels Mayer wrote: > >> sudo alsa-midi-latency-test -w 20 -r -R -i 36:0 -o 36:0 > > > > Perhaps better without sudo. > > I was just following Paul Davis' lead (*). > > For me, there's probably no need for this, as my user 'npm' has > membership in group jackuser spec'd in /etc/security/limits.conf : > > > ## Automatically appended by the Planet CCRMA jack-audio-connection-kit > > ## NPM changed '*' to @jackuser to limit priority escalation to jackd. > > @jackuser - rtprio 99 > > @jackuser - memlock 4194304 > > @jackuser - nice -10 > > And /etc/group has entries like: > > > jackuser:x:476:npm > > rtkit:x:470:npm > > Running as root sidesteps the need for such setup, as well as any > permissions issues on the devices under test. From what I can tell, > the only privileged access in the test program is indicated by the > following output from 'alsa-midi-latency-test': > > > set_realtime_priority(SCHED_FIFO, 99).. done. > > ............................. > (*): > On Fri, Jul 2, 2010 at 4:50 AM, Paul Davis <p...@linuxaudiosystems.com> wrote: > > just for comparison, here are the results for an RME Digiface: > > sudo /usr/bin/alsa-midi-latency-test -w -r -R -i 20:0 -o 20:0 > > ... > > best latency was 0.00 ms > > worst latency was 1.00 ms, which is great. > > Better if Paul re-ran the test with "-w 20" argument so his fancypants > RME doesn't end up unfairly claiming the 0ms latency title :-) ... > > Who will claim the low-latency, low-jitter title in this epic > battle-of-the-geek: > VLSI-implemented midi on the VT1712 or RME's custom FPGA programming?? > [[ http://old.nabble.com/Is-RME-HDSPe-AES-supported-by-alsa--td28460997.html > ]]. > > Note that RME's FPGA implemented MIDI and mixer lacks an important > feature we get on cheap vt1712 VLSI implementations: > MIDI control over the built-in digital mixer via envy24control: > http://alsa-tools.sourcearchive.com/documentation/1.0.22-1/midi_8c-source.html > (yes there's a built-in midi-controllable, 20 channel, 36-bit digital > mixer hidden in that cheap ebay vt1712 -- > http://www.via.com.tw/en/products/audio/controllers/envy24/ ). > > Digital mixing is an important feature of RME's TotalMix : > http://www.rme-audio.de/en_support_techinfo.php?page=content/support/en_support_techinfo_hdsp_totalmix_hardware > But MIDI control of that mixer seems to be lacking in alsa's hdspmixer > and RME's implementation: > http://www.rme-audio.de/forum/viewtopic.php?id=6105 > > -- Niels > http://nielsmayer.com > > PS: worlds' cheapest digital mixing console, take old/slow computer, > add linux and these: > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230491593275 > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260501295877 -- "Suse 11.2 - Proprietärer NVIDIA-Treiber Beitrag von stachelmaus » 3. Jul 2010, 12:48 Hi :) für einen selbst gebauten Kernel 2.6.31.6-rt19 x86_64 habe ich den proprietären NVIDIA Treiber installiert, für den neueren selbst gebauten Kernel 2.6.33.5-rt23 x86_64 versuche ich nun ausschließlich das Modul zu bauen, doch es funktionierte bisher nicht. Der wesentliche Auszug aus /var/log/nvidia-installer.log ist wahrscheinlich "[...] test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( \ echo; \ echo " ERROR: Kernel configuration is invalid."; \ echo " include/generated/autoconf.h or include/config/auto.conf are missing.";\ echo " Run 'make oldconfig && make prepare' on kernel src to fix it.[...]". Das ausführen von make oldconfig && make prepare hat nichts gebracht, bzw. existieren die Dateien include/generated/autoconf.h und include/config/auto.conf im Kernel src samt Inhalten. Wozu es auch immer gut sein mag, den Kernel 2.6.31.6-rt19 gebootet habe ich es u.a. mit sh ./NVIDIA*.run -a --no-questions -K --kernel-name=2.6.33.5-rt23 und den Kernel 2.6.33.5-rt23 gebootet u.a. mit sh ./NVIDIA*.run -a -K versucht. Der natürlich nicht aktualisierte Installer für eine GeForce 7200 GS ist NVIDIA-Linux-x86_64-195.36.15-pkg2.run. Grüße Ralf" (http://www.linux-club.de/viewtopic.php?f=48&t=110034) _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev