If you are going to use a 2.6 kernel, I highly recommend at
least 2.6.21. There have been some huge improvements and
bugfixes in the 2.6 USB stack recently.
Also, oddly, you might try flashing your motherboard to the
latest BIOS. One of mine got a lot better---apparently the
interrupt allocation on older BIOSes can be buggy.
In general, if your EHCI (USB 2.0 HS) doesn't work well for
other things, it probably won't work at all for this app...
Bart
In message <[EMAIL PROTECTED]> you wrote:
> On Mon, May 14, 2007 at 10:02:59PM +0200, Gert Brinkmann wrote:
> > Gert Brinkmann wrote:
> >
> > > hard disc is connected to an USB2 controller. The Problem: data transfer
> > > is very slow. It makes approx. 1 MByte/s only, but it should be more
> > > than 20 MByte/s. The hard disc is formatted as ext3fs and is mounted as
>
> IDE drives connected through a USB2/IDE translator may have problems.
> Gert's question encouraged me to to my own experiments. I have been
> using IDE hotswap with a customized 2.4.22 linux kernel. IDE hotswap
> is no longer in the kernel, so I have been experimenting with USB2
> hotswap on a 2.6.18 kernel (Scientific Linux 5, an RHEL5 clone).
>
> My experiment does multiple passes of filling and emptying a 422GB
> ext3 partition on a 500GB Seagate Barracuda 7200.9 PATA-100 drive.
> The computer is a 1.7GHz P4 with 1GB of RAM, using a no-name-chinese
> 3 port USB controller with a VIA Technologies VT6202 (date code 0301)
> USB2 interface chip.
>
> I wrote a little C program to write 100MB files, which sits in a
> shell script that does this 4300 times, reporting timing.
>
> I tried a bunch of different USB2 to IDE translators. Here are
> the results, from awful to OK:
> ---------------------------------------------------------------------
> 0) "Control" - direct IDE connection to Promise Ultra133TX2
> PCI controller with PDC20269 controller (date code 0409).
> Results: Wrote 430GB at 30.6MB/sec (4 hrs), as fast as it gets.
>
> 1) No-name-chinese, USB to IDE smart cable. 2005 swap meet.
> Claimed Linux compatability. Genesys GL811E bridge chip .
> Results: Doesn't even register with "lsusb". Doorstop,
> probably a defective individual unit.
>
> 2) SanMax/inClose USB2DOCK swap cage . 2003 Fry's Electronics.
> Cypress C768013 chip, 0304 date code.
> With a 2.4.22 kernel this locked up after an hour or so.
> 2.6.18 Results: locks up immediately
>
> 3) No-name-chinese, USB to IDE smart cable. May 2007 PCCLUB.
> Looks like the picture of a SABRENT device at Tiger Direct.
> Cypress AT2LP Demo RC17 chip according to lsusb -vv .
> Results: Worked for a while, moved 60GB in about an hour
> (16.7MB/s), then hung and locked up the kernel.
>
> 4) ViPower VP-1028LSF swap cage. 2003.03.17 design. 2004 purch.
> Genesys GL811USB chip, there are multiple versions :-(
> Results: Wrote 233GB at 11.0MB/sec (6 hrs), slow.
>
> 5) UltraSum TZ350B2 external enclosure. 2004 Local computer store.
> Myson Century CS88136-103 chip, 0410 date code.
> Bypassed wimpy power supply.
> Results: Wrote 430GB at 17.0MB/sec (7 hrs), tolerable.
>
> 6) ViPower VP-1028LSF swap cage. 2003.07.04 design. 2006 purch.
> Cypress C768300A chip 0404, there are multiple versions :-(
> Results: Wrote 430GB at 19.6MB/sec (6 hrs), tolerable.
>
> --------------------------------------------------------------------
> As you can see, a random sampling of USB2 drives and enclosures
> revealed scattered results, from broken to flaky to slow to tolerable.
> All of the drives are slow, compared to the 48MB/sec one might expect
> for a 480MB USB2 bus or thw 30MB/sec of a direct IDE connection.
> Perhaps handshaking and such slows USB to IDE connections down a lot.
>
> This will be on the wiki: http://wiki.dirvish.org/index.cgi?USB2drives
> Feel free to add to it. I am especially interested in USB2 to IDE
> smart cables, cheap/fast/good .
>
> Keith
>
> --
> Keith Lofstrom [EMAIL PROTECTED] Voice (503)-520-1993
> KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
> Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs
> _______________________________________________
> Dirvish mailing list
> [email protected]
> http://www.dirvish.org/mailman/listinfo/dirvish
_______________________________________________
Dirvish mailing list
[email protected]
http://www.dirvish.org/mailman/listinfo/dirvish
