Linux-audio-dev October 2002

linux-audio-dev@lists.linuxaudio.org

115 participants
142 discussions

[linux-audio-dev] latency performance of 2.4 and 2.5...

by Joern Nettingsmeier

hi andrew, hi everyone ! as per your request, i fearlessly built and booted 2.5.41 with preemption enabled. although it was my first take at the dev kernel, it went very smoothly :-D anyway, it seems to perform worse than 2.4.20-pre1-lowlatency. it feels very snappy on startup, but under load it is a lot less responsive to user interaction. i have run benno senoner's latencytest on both kernels. you can see the results at http://spunk.dnsalias.org/latencytest . for me, the biggest problem seems to be soft-raid. i have my /var partition striped over 2 scsi disks, and accessing them causes huge latency peaks. is there any chance to get this under control ? i don't have a spare disk around, so i can't easily compare to non-raid, but i'm quite sure it's the source of the problem, because people with similar hardware are doing fine. other than that, there were a few peaks under /proc stress, but they are not easily reproducible. i have not yet tested your mm-patches due to a compile failure (log is attached below). i used http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.41/2.5.41-mm3/2.5.41-mm3.…. if there's any patches to try or more benchmarks to run, let me know. best, jörn *** Hardware: Dual-P3 @ 600Mhz, 512MB PC100 SDRAM, ASUS P2B-DS one 4G IBM DCAS SCSI disk (/), 2 9G COMPAQ SCSI disks (/var, soft-RAID 0), SCSI CDROM and CDR, no IDE devices. Soundcards: SB Live (used during the tests) and Ensoniq 1371 (idle) The audio file that was played back during the tests came over NFS. *** make -f init/Makefile Generating include/linux/compile.h (updated) gcc -Wp,-MD,init/.version.o.d -D__KERNEL__ -Iinclude -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686 -Iarch/i386/mach-generic -fomit-frame-pointer -nostdinc -iwithprefix include -DKBUILD_BASENAME=version -c -o init/version.o init/version.c ld -m elf_i386 -r -o init/built-in.o init/main.o init/version.o init/do_mounts.o ld -m elf_i386 -e stext -T arch/i386/vmlinux.lds.s arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/built-in.o --start-group arch/i386/kernel/built-in.o arch/i386/mm/built-in.o arch/i386/mach-generic/built-in.o kernel/built-in.o mm/built-in.o fs/built-in.o ipc/built-in.o security/built-in.o lib/lib.a arch/i386/lib/lib.a drivers/built-in.o sound/built-in.o arch/i386/pci/built-in.o net/built-in.o --end-group -o .tmp_vmlinux1 fs/built-in.o: In function `isofs_put_super': fs/built-in.o(.text+0x390e5): undefined reference to `unload_nls' fs/built-in.o: In function `isofs_fill_super': fs/built-in.o(.text+0x39f0b): undefined reference to `load_nls' fs/built-in.o(.text+0x39f25): undefined reference to `load_nls_default' fs/built-in.o(.text+0x3a0c6): undefined reference to `unload_nls' fs/built-in.o: In function `wcsntombs_be': fs/built-in.o(.text+0x3c60b): undefined reference to `utf8_wctomb' make: *** [.tmp_vmlinux1] Error 1 -- Jörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)

21 years, 7 months

[linux-audio-dev] Tapiir

by Miha Tomsic

Hello Maarten and other LAD(y)s! I am having some problems with tapiir 0.6. It seem's I can't get it to run with SCHED_RR. I can run it with suid or as root and still I am getting: josef:/usr/src/tapiir-0.6/src# ./tapiir !!!Scheduler set to Round Robin with priority 99 FAILED!!! Make sure you are root, or that tapiir has the suid flag set ( chmod 4755 ) Any idea why this is happening? Thanks and take care, Miha...

21 years, 7 months

[linux-audio-dev] Tk Ecasound 0.8.1 Released!

by Luis Pablo Gasparotto

Download it from: http://www.sourceforge.net/projects/tkeca Changes: - Bug fixed in Close/Ok button in Recording/Mixdown Properties Windows Regards, Luis Pablo Ahora pod�s usar Yahoo! Messenger desde tu celular. Aprend� c�mo hacerlo en Yahoo! M�vil: http://ar.mobile.yahoo.com/sms.html

21 years, 7 months

[linux-audio-dev] Tk Ecasound 0.8.0 Released!

by Luis Pablo Gasparotto

Download it from: http://www.sourceforge.net/projects/tkeca Changes: - Recording / Mixdown properties windows Regards, Luis Pablo Ahora pod�s usar Yahoo! Messenger desde tu celular. Aprend� c�mo hacerlo en Yahoo! M�vil: http://ar.mobile.yahoo.com/sms.html

21 years, 7 months

Re: [linux-audio-dev] latency performance of 2.4 and 2.5...

by Joern Nettingsmeier

Peter L Jones wrote: > > On Friday 11 Oct 2002 13:48, Joern Nettingsmeier wrote: > [snip] > > i have run benno senoner's latencytest on both kernels. you can see the > > results at > > > > http://spunk.dnsalias.org/latencytest . > > > > Jörn, could you post the latencytest URL, please. > > Thanks, > > -- Peter http://www.gardena.net/benno/linux/latencytest-0.42-png.tar.gz -- Jörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)

21 years, 7 months

[linux-audio-dev] Meterbridge 0.0.5

by Steve Harris

http://plugin.org.uk/meterbridge/ New features: Jellyfish meter (aka. stereo phase meter) Can choose number of columns Signal freezes if you click left mouse button on the window Some segfaults fixed Outstanding problems: Uses contraversial rewiring connection to inputs Needle graphics still a bit crap Inefficient - Steve

21 years, 7 months

RE: [linux-audio-dev] Needing advice on implementing MIDI in my app (RTMix)

by John Lazzaro

> 2) Can I use DMIDI in combination with TCP/IP (I saw you mentioned UDP > on your site)? If you're sending over IP, you should also look at MWPP, an RTP packetization for MIDI under development in the IETF. See: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-mwpp.txt ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

21 years, 7 months

RE: [linux-audio-dev] Needing advice on implementing MIDI in my app (RTMix)

by Ivica Bukvic

Thanks for a quick reply. One more question: 1) Is there good documentation to be found, or even better, source code? 2) Can I use DMIDI in combination with TCP/IP (I saw you mentioned UDP on your site)? 3) Does application have to be DMIDI-aware in order to be able to send/receive MIDI via DMIDI server or does DMIDI server simply act transparently between sender and receiver (if they are presumably on the same machine)? Again, thanks for your help! Sincerely, Ivica Ico Bukvic > -----Original Message----- > From: Phil Kerr [mailto:philkerr@elec.gla.ac.uk] > Sent: Thursday, October 10, 2002 9:49 PM > To: Ivica Bukvic > Subject: Re: [linux-audio-dev] Needing advice on implementing MIDI in my > app (RTMix) > > Hi Ivica, > > DMIDI may be of some use to you. You can have one DMIDI server and your > MIDI > applications can broadcast DMIDI data. You use the server to isolate you > from > hardware and MIDI API's > > http://www.dmidi.org > > Cheers > > Phil >

21 years, 7 months

[linux-audio-dev] go try 2.5 - it's not that bad...

by Joern Nettingsmeier

hi guys ! i have just built and booted into 2.5.41, and it turned out to be easier than i thought. everything works as before, and the kernel has now been running stable for over a day. i would encourage other audio users to give it a try as well, it's painless. using a current distro (suse80), i didn't even have to update userspace tools (at least nothing has bitten me yet). be sure to have a backup, of course. i have only scsi disks, so i can't say how the IDE stuff turned out, but i hear it is sane again. best, jörn benchmarks coming.... -- Jörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)

21 years, 7 months

[linux-audio-dev] Needing advice on implementing MIDI in my app (RTMix)

by Ivica Bukvic

Hi all, Currently, I am working on implementing MIDI in my app, and this is what I am currently trying to solve: I just simply want to implement MIDI >not as a sequencer<, but rather as an external controller of various events (since this is what my app RTMix does). Now, the problem is also that I want to use MIDI for intercommunication between my app and other apps running concurrently on the same machine (i.e. Pd), so here is the list of questions I would greatly appreciate any help on: 1) First off, is there a simple GPL library that is easy to implement and that focuses on MIDI? If not, any website with some sample code would be greatly appreciated! 2) I am trying to design something that is not driver specific (i.e. OSS or ALSA), so is there any way to do this (i.e. sending message directly to /dev/midi device or something similar without blocking it to other apps) 3) For checking the presence of the midi interface on a Linux box, is it safest to look for /dev/midi device, or is there a "nicer" way? 4) Is there a way to send MIDI data in such a way that it is perceived by other app on the system (i.e. like sending a midi signal through midi-out which is via cable connected to midi-in on the same machine, except without doing so physically)? If so, how? If not, what are the alternatives (other than above-mentioned physical solution)? 5) Finally, this may be a bit far-fetched question, but here it goes anyhow: does anyone know if Pd and other applications like it are able to receive simple numeric messages via network (TCP/IP) protocol (since this would be an alternative to #4)? Any help on this matter is greatly appreciated! Sincerely, Ivica Ico Bukvic, composer, multimedia sculptor, programmer, webmaster & computer consultant http://meowing.ccm.uc.edu/~ico/ ============================ "To be is to do" - Socrates "To do is to be" - Sartre "Do be do be do" - Sinatra "I am" - God

21 years, 7 months

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Linux-audio-dev October 2002