Linux-audio-user December 2008

linux-audio-user@lists.linuxaudio.org

144 participants
133 discussions

Re: [LAU] Compiling fst or dssi-vst under ubuntu 64 bit]

by axax

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17 years

optimal disk performance, ubuntu

by Mike Mazarick

I was reading over this thread while researching a fix for my problem. I thought I would share what I happening on my machine, and hopefully it will provide you with some insight into your situation. I don't have the answer yet, but maybe I can provide a different view of what the problem is. I am currently trying to get 4 PCI cards with 8 channels to work with a new motherboard (MSI Neo 3FR). I also have an nvidia GeForce 9600 NGO video card, an Intel Core2 Extreme Quad processor, 4 GB of memory, and 4 Sata II disks installed. I am currently running Fedora Core 8, with CCRMA modifications for sound. The audio card is an old Gadget Labs card, and there is a linux driver, but it isn't part of the Alsa tree yet. I have to compile and install a module to make the Gadget Labs cards work. I can easily get 3 cards working (24 channels), but I am needing to do some 'black magic' to get 4 cards working. I am not getting any sound out of the fourth soundcard. So far, it sounds familiar, doesn't it? (not enough channels coming out). One of the benefits of having the new linux driver is that there is already some basic diagnostics built into the driver, and you can see reports in /var/log/messages of how long it takes to open or close the card to it's memory buffer. This was originally used because the interface chip was so old that it didn't have DMA, and a 'software DMA' had to be written, and this was the mechanism to test the card/driver and figure out its performance. For my particular system, because I can run a test and see the driver performance in /var/log/messages (I'm using Jack/Ardour for 'high level stuff, aplay, arecord, etc for low level stuff), I have seen that the video card driver is sending a bunch of interrupts down the PCI bus (even though it is on PCI Express). The particular driver that is sending the interrupts down the PCI bus is called NV, and is an open source implementation of NVidia drivers. I get rid of all graphics by issuing 'init 3' instead of being at the normal runlevel 5 (graphics). As an example for playback only, here are some statistics for one card in the graphics mode: [root@localhost tmp]# cat /var/log/messages |grep ISR ... Dec 13 12:18:23 localhost kernel: api_gl824_stop ISR took between 47 and 137 samples Dec 13 12:18:23 localhost kernel: api_gl824_stop Buffer transfers TO CARD within ISR took between 11 and 100 samples Dec 13 12:18:23 localhost kernel: api_gl824_stop Buffer transfers FROM CARD within ISR took between 35 and 125 samples (There is a 128 sample-memory on the card. It is easier to deal with samples than time, so the 44100khz or 48000khz can be scaled more easily. What you are seeing is that I am about to run out of time on the PCI bus if I only have 128 samples to play with) When I go to a non-graphics mode with init 3, I get the following results: [root@localhost tmp]# cat /var/log/messages ... Dec 13 22:03:22 localhost kernel: pcm_gl824_output_trigger 0 Dec 13 22:03:22 localhost kernel: api_gl824_stop Master card's clock position stopped at 1540 Dec 13 22:03:22 localhost kernel: api_gl824_stop ISR took between 2 and 4 samples Dec 13 22:03:22 localhost kernel: api_gl824_stop Buffer transfers TO CARD within ISR took between 2 and 4 samples Dec 13 22:03:22 localhost kernel: api_gl824_stop Buffer transfers FROM CARD within ISR took between 0 and 1 samples . Dec 13 22:07:48 localhost kernel: pcm_gl824_output_trigger 0 Dec 13 22:07:48 localhost kernel: api_gl824_stop Master card's clock position stopped at 1932 Dec 13 22:07:48 localhost kernel: api_gl824_stop ISR took between 10 and 12 samples Dec 13 22:07:48 localhost kernel: api_gl824_stop Buffer transfers TO CARD within ISR took between 10 and 11 samples Dec 13 22:07:48 localhost kernel: api_gl824_stop Buffer transfers FROM CARD within ISR took between 0 and 1 samples Dec 13 22:07:48 localhost kernel: pcm_gl824_output_hw_free Dec 13 22:07:48 localhost kernel: pcm_gl824_output_close What this means is that some interrupt in the graphics mode was taking up all the PCI bus. Now, further testing in nongraphic mode revealed that there is still an issue with hard disk interrupts taking up a lot of PCI bus time. I'm running arecord and aplay for about 30 seconds to see what the performance is. I'm recording and playing back 8 channels at once in the 32 bit noninterleaved mode. After I record 8 channels for about 30 seconds with arecord (creating one honkin' big file) and playing it back with aplay, I get the following stats when looking at the output of the card: Dec 14 09:39:15 localhost kernel: pcm_gl824_output_trigger 0 Dec 14 09:39:15 localhost kernel: api_gl824_stop Master card's clock position stopped at 397 Dec 14 09:39:15 localhost kernel: api_gl824_stop ISR took between 11 and 1498 samples Dec 14 09:39:15 localhost kernel: api_gl824_stop Buffer transfers TO CARD within ISR took between 0 and 98 samples Dec 14 09:39:15 localhost kernel: api_gl824_stop Buffer transfers FROM CARD within ISR took between 0 and 39 samples Dec 14 09:39:15 localhost kernel: pcm_gl824_output_hw_free This means that there are still interrupts happening on the PCI bus while the card is trying to play. I'm reading the following link to determine what is the best next thing to do, but I'm also looking at a modern equivalent to 'hdparm' (and maybe hdparm if I can get it to work with my Sata disks). Here's a link that gives an approach to solving the problem: http://www.gentoo.org/doc/en/articles/hardware-stability-p2.xml In my opinion, the problem I'm having is because the hard disks are 'too fast' with 'too much priority' and are taking up too much bandwidth on the PCI bus. You may be having the same thing happen. It may be that instead of your problem being that your disks are too slow, the real problem is that your disk may be too fast. I remember having very severe problems with disk interrupts when I first started using this software and scsi disks on a Sun V20z (which are much faster than IDE or SATA). Once I switched to a normal PC (with slower IDE disks), the underruns just disappeared. Fortunately with that setup, you could actually hear the disks move and see the underruns happen at the same time. If anyone else has been down this road and knows of how to solve the underlying issues (sata hard disk interrupts taking up too much PCI bandwidth), I am still searching for an answer and I'm VERY interested in hearing something from you. Thanks in advance, Mike Mazarick If someone else has been down this road

17 years

More New Music

by Chip VanDan

It's been a long while since I've updated my site, but I added 6 new songs to the bottom of my page. I appreciated all the helpful feedback I got from the last time I posted my music to this list and I'm hoping for the same results. All %100 Linux (even the included art was designed in Gimp and Inkscape) http://airlynx.sitesled.com Christopher VanDan ("Airlynx") -- -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCA/FA/S/O d+(--) s+: a-- C+++ L++ P E-- W++ N- o K? w O-- M- V- PS+ PE- Y+ PGP t- 5-- X R- !tv b++ DI++ D+ G+ e+/++ h--- r--/+++ z+++(*) ------END GEEK CODE BLOCK------

17 years

midi note controllers

by andy baxter

hello, I've been looking at the midi 1.0 specifications and it looks as if in midi you only have 3 controllers which apply specifically to a given note rather than a whole channel. I.e. volume, note number and aftertouch. All the other controllers seem to apply to all the notes played in a given channel rather than just a single note. Is this the case, or have later revisions of the midi spec provided ways of getting round this? I can't find a later midi spec on the web so assume there isn't a way round it. andy

17 years

how to manage expression control?

by confrey

Hi everybody, I wrote a few time ago about 'crescendo' in long notes, and I thank you for yours suggestes; now I'd like to know what's the finest mode to manage CC #11 : I've began to use Rosegarden, and I've seen in matrix editor I can define a lines to manage expression, but it works by big steps only, I'd like a better and smoothly effect; which sequencer software can I use? bye and thanks again confrey

17 years

fglrx + linux-rt + Ubuntu = possible!

by Matthias Schönborn

I did it! Finally I'm able to boot linux-rt with working (but proprietary) fglrx drivers. I used kernel versions 2.6.27-7 and 2.6.27-3-rt from the repos. Here's a Howto for everyone who also spend hours of frustration: 0. Uninstall the fglrx driver and linux-rt if installed. 1. Last night I found https://launchpad.net/~abogani/+archive . There's a subfolder "fglrx-installer". Download those debs (fglrx-amdcccle_8.543, fglrx-kernel-source_8.543, fglrx-modaliases_8.543, libamdxvba1_8.543, xorg-driver-fglrx_8.543, xorg-driver-fglrx-dev_8.543) and install them. Neither mess around with those other files like "fglrx-installer", I didn't need them, nor add the repository to your list (also not needed, linux-rt won't even install if you do that). If the files mentioned above aren't there, email me. 2. Just install linux-rt, image, headers, restricted modules in synaptic - watch for the dkms message! If fglrx was succesfully build in your standart kernel, it should automatically install for the linux-rt kernel. In my case it was confused because there was fglrx 8.552 and fglrx 8.543 installed, I had to remove version 8.552 in order to get it to build (sudo dkms remove -m fglrx -v 8.552 --all). If dkms in the details dialog in synaptic says it's alright you should be fine. I'm so happy, I'm going to post this on ubuntuusers.de and the proprietary ati driver wiki. Cheers! Matthias

17 years

USB audio interface for laptop Ubunto

by Brian Doucette

Hello, I am currently running Ubuntu on my Compaq Laptop. I am fairly new to Linux. I need a USB Audio Interface, I do audio production and do alot of onsite recording. I usually just plug my recording device (Tascam 788) directly into a music groups sounds system and record on 1 track, so I don't need anything realy fancy. I am hoping to spend around $200-$300 or so. Any recommendations or suggestions would be great. Thanks Brian

17 years

Creative Common License and Rerecordings/Concerts

by Nils Gey

Hi list, I have a license question, maybe you can help me. A short while ago I released my album "Laute Minne macht dich Hinne" (http://www.wargsang.de/download.php?file=1) under a CC-by-sa license. That means that anyone can do anything with the recordings (for example share, sell or remix them). But what does that mean for the music itself, the composition. If someone now plays one of my songs himself...? Is this covered by the license? Are people allowed or is this a complete different matter? I personally don't think people can play my songs, but I'm not sure. After all the CC-by-sa only means the recording itself, not the musical composition behind it. What do you thin? Nils

17 years

More linux live on the YouTubes

by Ken Restivo

Here are two short clips from last Friday night, of Linux being played live in a jazz-oriented context: http://www.youtube.com/watch?v=MuKqzVDR4wA http://www.youtube.com/watch?v=Yc5O-esJ8ko Bass (via fluidsynth) is left hand, Rhodes (fluidsynth going through CAPS amp simulator LADSPA plugin in ecasound) and AZR3 are right hand. The sound quality of the video isn't great, buit the Linux Laptop which is making all the keyboard and bass sounds, is clearly visible in the videos. What's that running on my screen? 1) Emacs (with the setlist and changes of the songs) 2) A couple rxvt's 3) Ion3 tiling window manager 4) Xclock so the drummer and I could keep track of our set length A lot of times I close the latop lid. But, when I leave it open, I'd like to have something more interesting showing on screen if it's going to be visible from the audience. Any ideas/suggestions as to what to run, that would be visually interesting, but not too CPU intensive? Thanks. -ken

17 years

Using linux-rt with Ati Mobility X700

by Matthias Schönborn

I hadn't got the time to do some music on my ubuntu machine the last few months, but yesterday I wanted to boot the rt-kernel on my machine. To my surprise, I only got a resolution of 800x600. I used to have the proprietary driver from ati.com installed; Though this one doesn't work on the Linux-rt kernel (no 3D acceleration), I used to get the desired resolution of 1400x1050. To regain this resolution, I tried several xorf.conf files, using "ati", "fglrx" and "vesa" as driver, but none worked. (In the process of doing so, I somehow even managed to screw up my Internet configuration on the main kernel (d'oh), so I'm actually writing this on 800x600... ) So my question is: Is there actually someone on this list, who is able to boot Linux-rt on his ubuntu machine, using an ati x700 mobility? I'd really appreciate any suggestions, more so working xorg.conf files and verified driver numbers. Greetings from Euskirchen Matthias

17 years

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Linux-audio-user December 2008