Renaud Gu�rin wrote:
>
> Le Lundi 03 Mars 2003 22:07, Gary A. Gorgen a �crit :
> > I have a system that I just built that has 6 pci HC's.
>
> So, nothing particular is needed to have usb-uhci detect and use them all,
> right ?
>
Nope, plug them in & go.
Are the HC's in your system UHCI only?
> > If your devices and hubs, are USB-1.1,
> > the hubs are going to kill you.
> > That looks like whats happening.
>
> My devices are USB1.1 indeed.
> Can you elaborate on why hubs make things worse ?
>
Each USB-1.1 controller is 12mb/sec.
Each port is 12/(number of ports) approx.
If you have 2 4-port hubs on a ctlr, then its, less than 12/8.
> > Here are some numbers I just ran: 2.4.21-pre5
> > USB-2.0, 4 port hub, connected to ehci port:
> > devices are USB-1.1 flash.
>
> Hmm, is there any gain to expect from using USB-2.0 HCs and/or hubs if the
> devices are all 1.1 ?
>
Not that I can see, BUT....
I haven't tried it with 2.5.X, & my 2.0 hub could be flaky.
Maybe someone knows the state of Transaction Translation.
You should be able to get 12mb/port, through EHCI, but I don't see it.
I haven't done much testing with hubs, I decided to go more HC's.
> > devices xfer
> > 4 285kb
> > 3 381kb
> > 2 571kb
> > 1 841kb
>
> Do you get these numbers from the usb stack ? If so, how ?
>
> Thanks for the help...
#!/bin/sh
time dd if=/dev/sda of=/dev/null bs=64k&
time dd if=/dev/sdb of=/dev/null bs=64k&
time dd if=/dev/sdc of=/dev/null bs=64k&
time dd if=/dev/sdd of=/dev/null bs=64k&
I don't know how to test this with modems.
I only have storage devices.
Send the out from:
cat /proc/bus/usb/devices|grep Bus
I may be able to help more.
gary,
--
Gary A. Gorgen | "From ideas to PRODUCTS"
| Tunxis Design Inc.
[EMAIL PROTECTED] | 10470 Pineville Ave. Cupertino, Ca. 95014
| Phone: (408) 973-1542
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