Am Thursday 05 May 2011 10:32:52 schrieb Thorsten Mühlfelder: > Hi, > > I'm using a high quality USB audio device (Burr-Brown Japan PCM2702) with > my Dockstar. I've configured mpd to use the hardware interface without dmix > because dmix seems to be broken on the ARM platform. > > But there is one problem left: sometimes clicks and pops can be heard. They > appear randomly up to 2 times a minute. My impression is that hard disk > data transfer causes them, because using "hdparm -t" makes the situation > worse. On the Dockstar all USB devices are connected via hub to the same > USB controller: > # lsusb > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB > Bus 001 Device 003: ID 0bc2:2120 Seagate RSS LLC > Bus 001 Device 005: ID 08bb:2702 Texas Instruments Japan Speakers > > Is it possible to give the USB audio data transfers a higher priority?
Another idea is that network traffic may cause this because eth0 has higher priority IRQ than USB: thorsten@dreamtheater:~$ cat /proc/interrupts CPU0 1: 68571661 orion_irq orion_tick 5: 2 orion_irq mv_xor.0 6: 2 orion_irq mv_xor.1 7: 2 orion_irq mv_xor.2 8: 2 orion_irq mv_xor.3 11: 94038944 orion_irq eth0 19: 37108202 orion_irq ehci_hcd:usb1 22: 0 orion_irq mv_crypto 33: 290 orion_irq serial 46: 25 orion_irq mv643xx_eth Err: 0 -- Thorsten Mühlfelder Salix OS: www.salixos.org _______________________________________________ ARMedslack mailing list ARMedslack@lists.armedslack.org http://lists.armedslack.org/mailman/listinfo/armedslack