Re: Huge CPU usage using USB hub's

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: R. McCarty (PcEngWork-NoSpam__at_mindspring.com)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 14:19:03 GMT

Maybe the % of USB Bandwidth is too high. Open Device Manager
Expand the Universal Serial Bus Controllers category. Double-Click
each USB Universal Host Controller - Advanced (Tab). Check the
bandwidth used. If abnormally high, you may need to use your Serial
port device on a different (Less utilized) USB channel.

"Quaoar" <quaoar@tenthplanet.net> wrote in message
news:OEYNUUWpEHA.1160@tk2msftngp13.phx.gbl...
> Thomas Johansen wrote:
>> Hi
>>
>> I have attached a USB -> 4x serial port adapter to my PC, running
>> WInXP Pro
>>
>> The following USB device gets installed when the device is inserted:
>>
>> Generic USB Hub (pluged into one of the Root HUB's)
>> 2x Moschip USB Compound Device (Each plugin to the Generic USB hub)
>> 4x Serial ports (2 of each MosChip USB compound devicve))
>>
>> The all work OK.
>>
>> But when I just open 1 COM port ( no traffic), the CPU usage jumps to
>> around 60%. Stays about the same, if I open the rest.
>>
>> The system is a Tranmetta 733 MHz, VIA chipset, USB 1.1 and 512 MB
>> DDR RAM.
>>
>> Is this normal ?
>>
>> Thomas
>
> How are you opening the com port(s)? Is there a serial device connected
> to the port(s)?
>
> Q
>

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