Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

6 participants
7533 discussions

[linux-audio-dev] Alternitif Bitkisel kanser ilaci Carctol Alternative Cancer Healing

by carctol＠yahoo.com

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23 years, 1 month

[linux-audio-dev] mpu401 fifo scheduling on linux2.4.18

by Bruce M Beach

Hello All I'm sending some midi data to synthesizer for playback and it appears that the fifo /dev/midi (cmpci mpu401 driver) is not emptying as fast as it should(could), since the play back is highly irregular. Here are some numbers. 1) The timeing slice remains constant at 30 msec +/- 3usec, timed both at the beginning and end of the loop, so the irregularities are not due to loop variations. 2) A maximum of 64 bytes burst, with around 5 bytes normal and an average of 1 byte (say) (ie many slices do nothing) can occur during a slice, the buffer for the driver is 128 bytes with around a maximum capability of around 116 bytes transmitted per slice, so the midi channel can easily sustain the transmission rate at the rate I am sending information. 4) System load while the program is running is around 0.1% 5) The midi performance remains the same even if I do something like build the kernel, and untar some package say glibc at the same time. When I say irregular I mean, for instance on a run of 16th notes the notes will radically speed up and slow down. The notes all have the correct pitches and voice changes etc. are all happening correctly. Just this strange tempo problem. Any thoughts or suggestions would be welcome. Bruce

23 years, 2 months

Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt

by Stefan Nitschke

> > > On my asus A7V266-E board i had to set down dma mode from DMA100 to >DMA33 > > get LL working fine. (<3ms) > >That is very interesting information (I have the same board). Did you >discover >this by trial and error? > Yes and No ;) i had one "old" cable to disk2 and when i tried the latency test on the 2nd drive (DMA33) all worked fine. I have the latest BIOS installed. - Stefan _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail

23 years, 2 months

Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt

by Stefan Nitschke

>From: Maarten de Boer <mdeboer(a)iua.upf.es> >Date: Wed, 20 Nov 2002 08:29:31 +0100 > >On 19 Nov 2002 15:29:19 -0500 >jfm3 <jfm3(a)ouroboros-complex.org> wrote: > > > I'm running the low latency and preemption kernel patches on 2.4.19. I'm > > getting disk copy latency of around 10ms. Since I'm a real time person > > (according to M. Goggins) who doesn't use the hd in real time, I can > > live with this, but it bugs me. I've tried ext2 and ext3, no difference. > > Any other tips? > >Do you have support for your chipset unabled under "IDE, ATA and ATAPI >Block devices" in your kernel configuration, and "Use PCI DMA by default >when available"? I believe this is rather important. > On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33 get LL working fine. (<3ms) - Stefan _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

23 years, 2 months

[linux-audio-dev] disk latency under 2.4.19 ll+preempt

by jfm3

I'm running the low latency and preemption kernel patches on 2.4.19. I'm getting disk copy latency of around 10ms. Since I'm a real time person (according to M. Goggins) who doesn't use the hd in real time, I can live with this, but it bugs me. I've tried ext2 and ext3, no difference. Any other tips? (Tue Nov 19 15:20:19) (root@head:/home/jfm3/latencytest/latencytest0.42-png) bash> ./do_tests none 3 256 0 350000000 x11perf - X11 performance program, version 1.5 The XFree86 Project, Inc server version 40200000 on :0.0 from head Tue Nov 19 15:20:32 2002 Sync time adjustment is 0.2320 msecs. 2000 reps @ 3.8063 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8071 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8092 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8064 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8187 msec ( 262.0/sec): Scroll 500x500 pixels 10000 trep @ 3.8095 msec ( 262.0/sec): Scroll 500x500 pixels 120 reps @ 52.5438 msec ( 19.0/sec): ShmPutImage 500x500 square 120 reps @ 52.7976 msec ( 18.9/sec): ShmPutImage 500x500 square 120 reps @ 52.9418 msec ( 18.9/sec): ShmPutImage 500x500 square 120 reps @ 52.8095 msec ( 18.9/sec): ShmPutImage 500x500 square 120 reps @ 52.8810 msec ( 18.9/sec): ShmPutImage 500x500 square 600 trep @ 52.7948 msec ( 18.9/sec): ShmPutImage 500x500 square fragment latency = 1.451247 ms cpu latency = 1.160998 ms 2.1ms ( 0)| 1MS num_time_samples=57348 num_times_within_1ms=57348 factor=100.000000 2MS num_time_samples=57348 num_times_within_2ms=57348 factor=100.000000 PIXEL_PER_MS=155 fragment latency = 1.451247 ms cpu latency = 1.160998 ms 2.0ms ( 0)| 1MS num_time_samples=20877 num_times_within_1ms=20877 factor=100.000000 2MS num_time_samples=20877 num_times_within_2ms=20877 factor=100.000000 PIXEL_PER_MS=155 fragment latency = 1.451247 ms cpu latency = 1.160998 ms 4.6ms ( 2)| 1MS num_time_samples=28116 num_times_within_1ms=28113 factor=99.989330 2MS num_time_samples=28116 num_times_within_2ms=28115 factor=99.996443 PIXEL_PER_MS=155 -rw-r--r-- 1 root root 350000000 Nov 19 15:23 tmpfile fragment latency = 1.451247 ms cpu latency = 1.160998 ms 6.9ms ( 44)| 1MS num_time_samples=68188 num_times_within_1ms=68144 factor=99.935473 2MS num_time_samples=68188 num_times_within_2ms=68144 factor=99.935473 PIXEL_PER_MS=155 -rw-r--r-- 1 root root 350000000 Nov 19 15:23 tmpfile -rw-r--r-- 1 root root 350000000 Nov 19 15:25 tmpfile2 fragment latency = 1.451247 ms cpu latency = 1.160998 ms 6.5ms ( 8)| 1MS num_time_samples=54930 num_times_within_1ms=54921 factor=99.983616 2MS num_time_samples=54930 num_times_within_2ms=54923 factor=99.987257 PIXEL_PER_MS=155 -rw-r--r-- 1 root root 350000000 Nov 19 15:23 tmpfile -rw-r--r-- 1 root root 350000000 Nov 19 15:25 tmpfile2 -- (jfm3 2838 BCBA 93BA 3058 ED95 A42C 37DB 66D1 B43C 9FD0)

23 years, 2 months

[linux-audio-dev] [OT] Linux Music & Sound Software site updated

by Dave Phillips

Greetings: As of November 19 2002 the Linux Music & Sound Applications pages have been updated. This site contains more links to Linux audio, MIDI, and DSP sites than you can shake a stick at (== a lot), making it the most comprehensive listing of its kind on the Internet. The site may be reached here: http://sound.condorow.net (USA) Here: http://linuxsound.at (Europe) Here: http://linuxsound.ymo.org (Japan) (As aways, the Japanese site will not update until midnight tonight.) Best regards, == Dave Phillips The Book Of Linux Music & Sound at http://www.nostarch.com/lms.htm The Linux Soundapps Site at http://linux-sound.org Currently listening to: New London Consort, "Veritas veritatum" (Carmina Burana)

23 years, 2 months

[linux-audio-dev] libsndfile failure

by Miha Tomsic

Hello! I keep getting strange problems with libsndfile 1.0.1 lib. I first noticed it running sweep and then I went back to libsndfile source and tried out ht etests and they die at reading wav files. josef:/usr/src/libsndfile-1.0.1/tests$ ./write_read_test wav pcm_test_char : char.wav .......... Line 314: sf_open (SFM_RDWR) failed : File contains data in an unimplemented format. josef:/usr/src/libsndfile-1.0.1/tests$ ./misc_test wav update_header_test : header.wav ........ Line 175: sf_open (SFM_RDWR) failed : File contains data in an unimplemented format. I don't remember having any problems with libsndfile apps before and I don't remember changing anything on my box lately. Any ideas what to do and what to check? Thanks and take care, Miha...

23 years, 2 months

[linux-audio-dev] wow. who'da thunk it?

by Paul Davis

We might be a bit early to the party. Maybe the real guests will kick our asses out the door. Hope not .... ---------------------------------------------------------------------- Yamaha Validates MontaVista Vision for Next-Generation Digital Audio Products ... MontaVista Linux Professional Edition 2.1 is one of the most widely used embedded Linux operating systems and development platforms. It includes an impressive array of cross-development tools for system and application code, unparalleled processor and board support, native real-time performance in Linux, and hundreds of deployable utilities, libraries, drivers, and other run-time components. Earlier this year, MontaVista Linux Professional Edition was named Best Embedded Linux Solution at the New York Linux World and Expo. The product received the Electron dOr award for Best Embedded Tool and Development Solution for 2002 from the prestigious French publication Electronique, and the Readers Choice Award for Favorite Embedded Solution 2002 from the American magazine Linux Journal. http://www.mvista.com/news/2002/yamaha.html

23 years, 2 months

[linux-audio-dev] matter of urgency !!!

by engr bankole

FROM:ENGR BANKOLE ADEKANMI, PETROLEUM AND PROJECT DIVISION FALOMO, LAGOS-NIGERIA This letter is not intended to cause any embarrassment in whatever form,rather is compelled to contact your esteemed self, following the knowledge of your high reputes and trusts worthiness. Firstly, I must solicit your confidentiality; this is by the virtue as Being utterly confidential and top secret though I know that a Transaction Of this magnitude will make anyone apprehensive and worried, but I Am assuring you that all will be well at the end of the day. A bold step Taken shall not be regretted I assure you. I am Engr Bankole Adekanmi, and I head a seven men tender board in charge of contract awards and payment approvals, I came to know of you in Search of a reliable and reputable person to handle a very confidential business transaction which involves the transfer of a huge sum of money to foreign account requiring maximum confidence. My colleagues and I are top officials of the NIGERIA NATIONAL PETROLEUM CORPORATION (NNPC) OUR DUTIES INCLUDING EVALUATION AND FORESEEING THE MAINTENANCE OF THE REFINERIES IN ALL THE OIL PIPELINES. We are therefore soliciting for your assistance to enable us transfer into your account the said funds. The source of the fund is as follows, during the last Military regime here in Nigeria this committee awarded a contract of US$400 Million to a group of five construction companies on behalf of the NIGERIA NATIONAL PETROLEUM CORPORATION for the construction of the oil pipeline in Kaduna, Port-Harcourt, Warri refineries, during this process my colleagues and I deliberately inflated the total contract sum to the tone of US$443 Million with the intention of sharing the inflated sum of US$43Million. The Government has since approved the sum of US$443Million for us as the contract sum, but since the contract is only worth US$400Million,the remaining US$43Million is what we intend to transfer to reliable and safe offshore account, we are prohibited to operate Foreign account in our names since we are still in Government. This making it impossible for us to acquire the money in our name right now, I have therefore been delegated as a matter of trust by my colleagues to look for an oversea partner into whose account we can transfer the sum of US$43Million. My colleagues and I have decided that if you / your company can be the beneficiary of this funds on our behalf, you or your company will retain 25% of the total sum of US$43Million while 75% will be for us the officials. We have decided that this transaction can only proceed under the following condition: 1. That you treat this transaction with utmost secret and confidentiality and Conviction of your transparent honesty. 2.That upon the receipt of the funds you will release the funds as instructed by us after you have removed your share of 20%. please acknowledge the receipt of this letter using the above email address. I will bring you into the nomenclature of this transaction when I have heard from you, your urgent response through my email, you will be highly appreciated as we are catching on the next payment schedule for the financial quarter. Please be assured that this transaction is 100% legal/risk free, only Trust can make the reality of this transaction. Best regards, ENGR BANKOLE ADEKANMI.

23 years, 2 months

[linux-audio-dev] Paper: sub-msec latency on a shielded CPU on SMP

by Benno Senoner

Interesting article about achieving sub-msec response times by "dedicating" one of the CPUs of a SMP box to high priority tasks using a CPU shielding method. http://www.linuxdevices.com/articles/AT8610061752.html Unfortunately most of us have only single CPU boxes which means that we rely on the performance of the low latency / preemptive patches. According to Jussi L. the 2.4 patches seem currently having problems with ext3 writes (journaling) but ReiserFS seems ok. Jussi told me too that it seems that RedHat 8.0 does something nasty because he got bad latencies on that distro (2.4+his -jl improved lowlat patch). Any news on that front ? What worries me is Red Hat 8.0 since it will become a pretty popular distro soon because it is targeted for the desktop. This means soon we will have user complaining why their systems cannot deliver solid sub-3msec latency. Hopefully ext3 and other issues get fixed soon. cheers, Benno -- http://linuxsampler.sourceforge.net Building a professional grade software sampler for Linux. Please help us designing and developing it.

23 years, 2 months

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Linux-audio-dev