High speed USB 2.0

[Hans Petter Selasky]

Hi,

On Tuesday 13 June 2006 17:05, Василий Петров wrote:
>
> > > Yet I don't understand, must high-speed devices work with bundled
> > > FreeBSD drivers and it is my conf problem or this is not supported by
> > > them? I haven't found any mentions about it in mailing lists nor PRs.
> >
> > Your config is supported by FreeBSD 6.0-RELEASE.
>
> I've done dd tests and got VERY strange results. When I try to read from
> device itself (/dev/da0 or /dev/da0s1) I have 27Mb/sec.
> However when I mount NTFS partition, that resides on that drive, big file
> is read from that partition at 600Kb/sec. I understand, that there is some
> overhead, but not that much of course.
> So it seems that problem not with USB, but with what then? 

One of the upper layers are probably reading too small chunks of data at a 
time. Probably it has got something to do with the implementation of the NTFS 
driver. I think you will get better results with UFS and FAT32, for example. 
I am not an expert at file systems.

--HPS