[haiku] Re: Haiku support for USB drives

"Michael Lotz" <mmlr@xxxxxxxx> wrote:
> On Mon, 26 Jan 2009 15:13:17 +0100 CET, Axel Dörfler wrote
> >Nicholas Blachford <nicholas@xxxxxxxxxxxxxx> wrote:
> >> Annoyingly it appears to be just as slow though.  This is not the  
> >> drives fault (writing is very fast from a Mac).  An optimisation 
> > > for  
> >> later methinks...
> > USB is also unbelievably slow on my laptop. I'm not sure what's 
> > wrong there, as I haven't looked into it yet. Could have something 
> > to do with the BIOS putting all devices on a single interrupt line.
> The interrupt config will certainly hurt a bit, but there's an easier
> explanation for slow USB mass storage: It's not yet optimized at all. 
> I still
> have to rework the usb_disk driver to use the io hook instead of the 
> old
> read/write hooks as suggested by Ingo way back ;-) Right now 
> everything's
> synchronous which wastes a lot of performance.

I don't know if that can really hurt performance that much, I also 
think that your stack has been way faster for me on other machines 
already. I barely get USB 1.1 speed here (via EHCI).

Bye,
   Axel.

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