[LAU] jack2 set to realtime / soft mode, normal kernel ?

[Arnold Krille]

Hi,

On Saturday 10 July 2010 23:16:40 Harry Van Haaren wrote:
> Advantages of firewire approach:
> 1. Bus design. Internally, the firewire chip doesnt have to ask the CPU to
> copy data
> to its port, it just does it, while USB devices use the CPU for this task.
> 2. On cheap laptops (and unfortunat others) the IRQ's between USB &
> something else
> collide. This means worse performance. (I'm aware that Firewire IRQ's can
> collide too,
> but I've never seen that phenomena before.)
> 3. Firewire daisy chaining does still exist, at least for the Echo
> Audiofire devices that I have.
> 4. I run a laptop (so PCI / PCI-E and a lot of other options are out. )
> 5. From my experiences, Firewire devices seem to be more geared towards
> professional use,
> while USB targets the "pro-sumer" market. (No flame bait intended here..)

Here are more firewire-advantages:

6. Synchronous transport for streaming data. Also streaming stuff is initiated 
by the device, not by the cpu.
6.5 This results in a bus-wide clock to sync devices which enables the daisy-
chain usage of multiple devices.
7. Guaranteed bandwidth and latency (up to a certain maximum), devices will 
not steal each others time as with usb.

The IRQ-problems applies to all pci, usb and firewire the same. If the 
interrupts collide and you can't change them, it will not work...

Have fun,

Arnold
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