[haiku] Re: Haiku support for USB drives
- From: "Michael Lotz" <mmlr@xxxxxxxx>
- To: haiku@xxxxxxxxxxxxx
- Date: Mon, 26 Jan 2009 15:36:51 +0100
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.
Regards
Michael
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