Atte Andr? Jensen wrote: > Jack O'Quin wrote: > >> "Best" depends on your needs and priorities. > > > I would accept a kernel that is only used for music. Actually the only > thing I need realtime for is running csound5 in realtime controlled over > midi. I just upgraded from csound4 and performance is better in csound5, > but still I cannot get buffersize lower than 512 (csound-alone-latency: > 12ms = too much) without a click every 30 secs or so. csound4 clicked > much more, about every 2 secs, so I'm thinking I'm close, mainly due to > the fact csound5 is able to use the alsa drivers instead of > oss-emulation. > After weeks of patching, re-patching, failed patches, on a Startcom Distro, I installed FC3 > CCRMA, 2.6.10-0.6.rdt.rhfc3.ccrma & 2.6.10-2.1.ll.rhfc3.ccrma kernels > audio apps. The * -2.1.ll crashed a couple of times so I stayed with the -.0.6.rtd and had it installed, upgraded, functional and stable in hours. With some experimental configuring it is running at .667ms qjackctl, ardour, hydrogen, on-board AC97 sound with 0 Xruns. Loading jack_rack, qsynth, rosegarden and Zyaddsubfx through qjackctl hasn't caused an xrun but I haven't played or recorded with these yet. > >> For the easiest solution, go with PlanetCCRMA (Fedora/RedHat) or >> AGNULA/DeMuDi (Debian). They've got this stuff all integrated and >> readily available for binary download. > > > I'm not interrested in "easy" but in "best". I'm on debian/unstable, so > maybe agnula would be possible. I just want to make sure that my current > system is not "infected" with all kinds of agnula stuff. Is it possible > just to get the low-latency kernel and use on an unstable system? For myself CCRMA was win/win, easy/best. Just curious if others are getting latency down to .677 +- or am I fooling myself. I've yet to get a latency-test program to work. Athalon oc'd to 3200+ 1G ram 120g hd qjackctl; Frames/Period=16 Sample Rate=48000 Peroids/Buffer 2 Ardour; jack>latency>32= 0.7msecs hdparm -m 8 -d 1 -u 1 -c 1 -K 1 /dev/hda/ lspci 00:06.0 Multimedia audio controller: nVidia Corporation nForce2 AC97 Audio Controler (MCP) (rev a1) 01:08.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 05) | from http://www-106.ibm.com/developerworks/library/l-hw2.html #"open up" the PCI bus by allowing fairly long bursts for all devices, increasing performance setpci -v -d *:* latency_timer=b0 #maximize latency timers for network and audio, allowing them to transmit #more data per burst, preventing buffer over/underrun conditions setpci -v -s 00:06.0 latency_timer=ff setpci -v -s 01:08.0 latency_timer=ff |
