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@email-addr-hidden:~$ 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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Received on Sun Jul 11 04:15:02 2010
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