hello, i've recently installed ubuntustudio in parallel with osx on my macbook pro. ubuntu is basically running fine but i'm having troubles getting it to perform equally well as in osx. i'm mainly using supercollider and i have an edirol fa-101 firewire interface. ubuntu resp. the preinstalled ffado-drivers detected the interface immediately and i could use it with supercollider (via jackd(mp)) easily. however, the performance is by far not as good as under osx. a simple test-patch in supercollider that was consuming about 30% cpu max. in osx (tested withcoreaudio as well as jack, started via jackrouter) was quickly using up to 100% in linux, producing lots and lots of xruns. after asking on the supercollider-mailinglist someone pointed me to this address: http://wiki.linuxmusicians.com/doku.php?id=system_configuration where i found this test: https://github.com/raboof/realtimeconfigquickscan after executing the test i followed the recommended steps to tune my system. this is the current state: == GUI-enabled checks == Checking if you are root... no - good Checking filesystem 'noatime' parameter... found - warning /media/exchange does not have the 'noatime' parameter set /media/satellite does not have the 'noatime' parameter set /media/scratch does not have the 'noatime' parameter set /media/burn does not have the 'noatime' parameter set /media/G4 does not have the 'noatime' parameter set /media/emergency does not have the 'noatime' parameter set For more information, see http://wiki.linuxmusicians.com/doku.php?id=system_configuration#filesystems Checking CPU Governors... CPU 0: 'ondemand' CPU 1: 'ondemand' - not good Set CPU Governors to 'performance' with 'cpufreq-set -c <cpunr> -g performance' See also: http://linuxmusicians.com/viewtopic.php?f=27&t=844 Checking swappiness... 10 - good Checking for resource-intensive background processes... none found - good Checking checking sysctl inotify max_user_watches... >= 524288 - good Checking access to the high precision event timer... readable - good Checking access to the real-time clock... readable - good Checking whether you're in the 'audio' group... yes - good Checking for multiple 'audio' groups... no - good yes - good. Checking the ability to prioritize processes with chrt... yes - good Checking kernel support for high resolution timers... found - good Kernel with Real-Time Preemption... not found - not good Kernel without real-time capabilities found For more information, see http://wiki.linuxmusicians.com/doku.php?id=system_configuration#installing_a_real-time_kernel Checking if kernel system timer is set to 1000 hz... found - good Checking kernel support for tickless timer... found - good == Other checks == Checking filesystem types... ok. not found. ** Warning: no tmpfs partition mounted on /tmp For more information, see: - http://wiki.linuxmusicians.com/doku.php?id=system_configuration#tmpfs - http://lowlatency.linuxaudio.org ** Set $SOUND_CARD_IRQ to the IRQ of your soundcard to enable more checks. Find your sound card's IRQ by looking at '/proc/interrupts' and lspci. ... i've even built a new kernel from the latest sources of the stable 3.2 branch (for some reason i wasn't successful building it "preemptive" though the config says it is). however, with this configuration the performance is just as bad as before or even worse. my startup-configuration for jackd(mp) is the following: /usr/bin/jackd -P89 -p128 -t1000 -dfirewire -r96000 -p512 -n3 -i8 -o8 admittedly this may be tight but using a 128 sample buffer at 96 khz is no problem on osx and i am interested in keeping latency as small as possible. but even with a 1024 sample buffer i'm getting xruns and cpu-usage is really high compared to osx. has anyone on this list experience with my particular setup (ubuntustudio, firewire soundcard, macbook pro core 2 duo)? any help highly appreciated, stefan -- View this message in context: http://linux-audio.4202.n7.nabble.com/macbook-pro-core-2-duo-ubuntustudio-configuration-tp79834.html Sent from the linux-audio-user mailing list archive at Nabble.com. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
