Hi, On Mon, Nov 30, 2020 at 09:22:13PM +0000, Riccardo Wanke via Alsa-user wrote: > I try to compile my kernel adding the ieee1394 drivers and all other > possible things that may help (adding the CONFIG_SND_FIREFACE). In Ubuntu distribution, the package named as 'linux-modules-extra' includes kernel modules relevant to Linux FireWire subsystem. For example of 5.7.0-15-generic kernel: https://packages.ubuntu.com/groovy/amd64/linux-modules-extra-5.7.0-15-generic/filelist > I know that I may use FFADO, but actually the things seems to be more > complicated: the problem seems actually the connection that does not > work properly (with the use of two adapters). As long as I experienced, in Linux system, launching interrupt handler triggered by peripherals on PCI-Express bus via PCI-Express protocol in Thunderbolt 3 bus includes large jitter. I guess that Linux driver for Thunderbolt chipset uses spin-locks carelessly and CPU waits release of the spin-lock with IRQ-disabled state, but I didn't investigate further because current my focus is on protocol implementation for audio and music units on IEEE 1394 bus. Anyway it's required to have extra care of the jitter so that any driver processes content of isochronous packet of IEEE 1394 within interval of interrupt scheduled by the driver via 1394 OHCI. Regards Takashi Sakamoto _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
