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Date: Sat, 8 Jan 2005 13:47:36 -0800 (PST)
From: Arne "Wörner" <arne_woerner@yahoo.com>
To: Paul Hoffman <phoffman@proper.com>, freebsd-usb@freebsd.org
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Subject: Re: Getting USB2 on FreeBSD 5.3?
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> da0 at umass-sim0 bus 0 target 0 lun 0
> da0: <ST312002 6A 3.04> Fixed Direct Access SCSI-0 device
> da0: 1.000MB/s transfers
>
I thought, USB1.1 can do 1.5Mbytes/sec and USB2 can do 480Mbit/sec
(I read it in advertisements for USB devices).

Why does da0 say, that it can do just 1MBytes/sec?

> [[ I replied:
> Actually, it helps some. I am seeing similar results (well, 7.1
> MB/s), so this is a bit heartening. But it doesn't explain why
> we're not seeing the 50 MB/s we're supposed to be seeing. ]]
>
480/8 is 60, isn't it? So we should see 60 MB/s, or is it just
marketing talk? I like it, when FreeBSD is nearly as fast as
possible (several years ago some FreeBSD NIC drivers were quite
efficient).

I am wondering, why my USB1.1 Cytronix SmartMedia card reader does
not more than 1MBytes/sec...

I just wanted to point out some little aspects of the problem...

-Arne



		
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