[LAU] Focusrite Saffire Pro 40 - reliable?

Jeremy Jongepier jeremy at autostatic.com
Sun Mar 1 15:53:57 UTC 2015

On 03/01/2015 04:42 PM, Len Ovens wrote:
> ice1712 - 16/2
> ens1370 - 32/2
> fw    - 32/2
> USB    - 64/2
> Intel HDA - 64/3
> These seem to be based on the size of the HW buffer in the IF itself
> and/or the bus protocol in use. AES67 suggests 16/3 (1ms) and I suspect
> both FW and USB may bennefit from /3 as well after reading the AES67
> reasoning for 3 buffer use.

<pissing contest alert>Fwiw, I can go down to 8/3 with my USB interface
;)</pissing contest alert>

> Anyway, all of the things I do for a PCI audio IF, I would also do for
> the USB or FW host card. In a desktop machine, I would tend not to trust
> any onboard FW or USB hosting, choosing rather to buy a PCIe card and
> treat that card the same as I would a PCI(e) audio card. I have found
> with USB audio IFs that when setting up /etc/default/rtirq it is best to
> single out the USB port I am using for sound.

Forgot about that one, I have bought a separate PCIe USB card with a
recommended host controller specifically for my USB interface and I also
made sure its IRQ gets a high prio.


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