Very slow umass in 6.2-RC2
olli at lurza.secnetix.de
Thu Feb 22 08:37:58 UTC 2007
Alexander Shikoff wrote:
> Wang Yi wrote:
> > Alexander Shikoff wrote:
> > > I have Apacer Flash:
> > >
> > > umass0: vendor 0x1005 USB FLASH DRIVE, rev 2.00/1.00, addr 2
> > > da0 at umass-sim0 bus 0 target 0 lun 0
> > > da0: < USB FLASH DRIVE 34CH> Removable Direct Access SCSI-0 device
> > > da0: 40.000MB/s transfers
> > > da0: 3936MB (8060928 512 byte sectors: 255H 63S/T 501C)
> > >
> > > Writing to this device is very slooooow.
> > >
> > > Time taken to copy file of 1,4G is near 30 min.
> > Did you try it under Windows? How time does it spend?
> You may laugh but I have no Windows-based boxes with USB 2.0... :)
> Whatever it seems that this Apacer flash drive under Windows and USB 1.0
> is faster than under FreeBSD and USB 2.0...
> Soon I will have a possibility to compare Apacer 4GB with Transcend
> flash. I'll report detailed results here.
Are you sure that your USB device supports hi-speed?
Being USB 2.0 has _no_ meaning at all. Some cheap
USB sticks support only full-speed, even though they
are compliant with USB 2.0. Please check the manual
or data sheet of your device to verify that it really
supports hi-speed (or check with a different OS such
You wrote that 1.4 GB take almost 30 minutes. That's
roughly 7 Mbit/s, which sounds quite reasonable for
a full-speed device (raw speed 12 Mbit/s).
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M.
Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung:
secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün-
chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart
Any opinions expressed in this message are personal to the author and may
not necessarily reflect the opinions of secnetix GmbH & Co KG in any way.
FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd
"I made up the term 'object-oriented', and I can tell you
I didn't have C++ in mind."
-- Alan Kay, OOPSLA '97
More information about the freebsd-stable