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Hardware and Windows Vista Hardware issues in relation to Windows Vista. (microsoft.public.windows.vista.hardware_devices)

USB Performance and configuration...



 
 
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Old March 22nd 08, 09:47 PM posted to microsoft.public.windows.vista.hardware_devices
Howard Woodard
external usenet poster
 
Posts: 73
Default USB Performance and configuration...

I have a Sony Vaio desktop that has 4 USB 2.0 connectors on the back and 2
USB 2.0 connectors on the front. I've noticed that I'm getting nowhere near
the 480 mbps throughput of a 2.0 device. In fact, I'm lucky to get more
than about 4.5 mbps with 1.5 mbps being fairly common as well. The devices
are external USB drives and the performance that I'm referring to is the
transfer rate that is reported during a file transfer.

I looked at the Device Manager, expecting to see something that looks like 6
USB ports. What I see is:
**Universal Serial Bus controllers**
- SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth)
- SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth)
- SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth)
- Standard Enhanced PCI to USB Host Controller (System Reserved 20%
bandwidth)
- USB Mass Storage Device
- USB Root Hub (full speed)
- USB Root Hub (full speed)
- USB Root Hub (full speed)
- USB Root Hub (high speed)

The only USB device connected at the moment is a 4 gb USB flash drive in one
of the two front connectors and configured for use by ReadyBoost.

Do any of you folks know:
(1) how the devices [in Device Manager] above relate to the physical
connectors (4 rear/2 front)?
(2) how the bandwidth gets assigned to the host controllers and whether it
can be changed or not?
(3) why the hubs report less than high speed and whether that can be changed
or not?

Thanks in advance,

Howard


  #2 (permalink)  
Old March 24th 08, 06:27 PM posted to microsoft.public.windows.vista.hardware_devices
Howard Woodard
external usenet poster
 
Posts: 73
Default USB Performance and configuration...

Any USB experts out there?

=====================================

"Howard Woodard" wrote in message
...
I have a Sony Vaio desktop that has 4 USB 2.0 connectors on the back and 2
USB 2.0 connectors on the front. I've noticed that I'm getting nowhere
near the 480 mbps throughput of a 2.0 device. In fact, I'm lucky to get
more than about 4.5 mbps with 1.5 mbps being fairly common as well. The
devices are external USB drives and the performance that I'm referring to
is the transfer rate that is reported during a file transfer.

I looked at the Device Manager, expecting to see something that looks like
6 USB ports. What I see is:
**Universal Serial Bus controllers**
- SiS 7001 PCI to USB Open Host Controller (System Reserved 10%
bandwidth)
- SiS 7001 PCI to USB Open Host Controller (System Reserved 10%
bandwidth)
- SiS 7001 PCI to USB Open Host Controller (System Reserved 10%
bandwidth)
- Standard Enhanced PCI to USB Host Controller (System Reserved 20%
bandwidth)
- USB Mass Storage Device
- USB Root Hub (full speed)
- USB Root Hub (full speed)
- USB Root Hub (full speed)
- USB Root Hub (high speed)

The only USB device connected at the moment is a 4 gb USB flash drive in
one of the two front connectors and configured for use by ReadyBoost.

Do any of you folks know:
(1) how the devices [in Device Manager] above relate to the physical
connectors (4 rear/2 front)?
(2) how the bandwidth gets assigned to the host controllers and whether it
can be changed or not?
(3) why the hubs report less than high speed and whether that can be
changed or not?

Thanks in advance,

Howard


 




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