Re: [Libusb-win32-devel] Full speed bandwidth?

[Black M. <bla...@ho...>]

Thanks, i'll try messing around with the pics buffering some more


>From: Stephan Meyer <ste...@we...>
>Reply-To: lib...@li...
>To: lib...@li...
>Subject: Re: [Libusb-win32-devel] Full speed bandwidth?
>Date: Mon, 06 Mar 2006 19:44:53 +0100
>
>
>Here are some values I get with one of my test programs using
>the synchronous API and an old 8051 Cypress full speed chip
>(double buffering enabled, 64 bytes endpoint buffer):
>
>- the second column is the transfer size in bytes
>- the third column is the throughput in kbytes/s
>
>
>bulk write      |     64 |   32
>bulk write      |    640 |  312
>bulk write      |   6400 |  892
>bulk write      |  64000 | 1041
>bulk write      | 640000 | 1031
>bulk read       |     64 |   31
>bulk read       |    640 |  312
>bulk read       |   6400 |  893
>bulk read       |  64000 | 1041
>bulk read       | 640000 | 1031
>interrupt write |     64 |   32
>interrupt write |    640 |   56
>interrupt write |   6400 |   61
>interrupt write |  64000 |   62
>interrupt write | 640000 |   62
>interrupt read  |     64 |   31
>interrupt read  |    640 |   56
>interrupt read  |   6400 |   61
>interrupt read  |  64000 |   62
>interrupt read  | 640000 |   62
>
> >
> > Hi, im trying to do large bulk transfers to a full speed USB device 
>(12mbit)
> > Yet even in a dead loop, at best iv gotten 1.6mbps (yes, bits per 
>second)
> > with 2k transfer sizes. Think I might get any better with async? My 
>device
> > atm is a pic18f4550 without ping pong buffers enabled but id assume I 
>should
> > get better then 1.6mbps even without them (Unless maybe its stalling?) 
>and
> > the pic isent actualy doing anything with the data. 64byte buffer on the 
>pic
> > side
> > Is async even complete enough to use at all? When is 1.0 due out anyway? 
>And
> > I can't even seem to find any documenation about async :( I really don't
> > want to have to go to using the DDK directly.
> >
> >
> >
> >
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