Alan Stern wrote: > Clemens: > Are you the right person to ask about snd-usb-audio?
Yes. > [...] > However, the logs also showed that snd-usb-audio submits one iso URB, > containing only one packet, per ms. That creates a lot of interrupts; one > every millisecond. The computations in the driver are too complicated for > me to figure out quickly. However I don't see any reason why the driver > shouldn't put, say, 20 packets in each URB and then submit URBs every 20 > ms. It usually does put more than one packet into each URB, except when an application requests interrupts at a higher rate, or when the nrpacks module parameter is set to a lower value. The output from speaker-test indicates that it sets the period size to 64 KB (i.e., interrupts every 341 frames), so I guess that nrpacks is set to 1. (I've heard that using nrpacks=1 is a way to trigger those incorrect bandwidth warnings.) Regards, Clemens ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
