On 07/10/2010 11:16 PM, Harry Van Haaren wrote:
Hi!
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.)
On my notebook I can' t get Firewire to work without a realtime kernel
and rtirq-init because the Firewire controller shares an IRQ with a load
of other things:
jeremy@soushi:~$ cat /proc/interrupts | grep 1394
16: 119 1453949 IO-APIC-fasteoi uhci_hcd:usb3, ohci1394,
eth7, mmc0, jmb38x_ms:slot0, nvidia
Tomtidom, that's an USB port, a Firewire controller, a WiFi controller,
a cardreader and a GPU. It's probably the most crowded IRQ that ever
existed on the face of the earth ;)
Best,
Jeremy
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