In Reply to: Re: USB modem uses very high CPU posted by Jeff Roberts on 05/06/02 at 10:47 PM:
Thanks for replying - That was one of the 1st things I tried - No effect. I've made sure the filter drivers are in fact loaded in WinXP (the install program is terribly buggy). Also have the 4in1 filter drivers loaded as well as the latest from Asuscom.com.tw (I think they fix specific issues though - Hibernation resume problems etc).
I still fail to see why there's a 60% drop in resource consuption when moving the device from onboard USB to PCI/USB - and why it still uses 20-30% on a P450.
I even tried the custom Via PCI latency patch - no effect either - as well as every conceivable BIOS config. Tried disabling the onboard USB controller - but as your site says: It promptly disables the PCI board also.
I wonder how Via makes a living when looking at their message boards.
I found some articles about a USB scanner consuming 80% resources in XP - and was solved with some "polling timout" setting in the registry. I've tried similar settings with this modem to no effect either. (I think it has more to do with the polling for a check if the scanner button is pressed).
Also found a post of a AOpen USB modem behaving similar - the guy returned it though (no luxury like that here).
Was thinking if its possible to install Win2k USB driver on WinXP for the PCI board?
: VIA has known PCI latency issues that probably contribute to the problems you are having. The patch is available on the VIA page. You might want to try the USB filter patch 1.10 as well. Read the instructions and comments for the filter driver. the PCI Latency patch is at the end of the Drivers section.
: Jeff Roberts
: : We find that USB modems use more CPU cycles than even Winmodems, generally. I consider USB modems to be a bad idea, poorly executed.
: : Know what I would do? Get a faster CPU!
: : ;-)
: : Bill
: : : Hi
: : : Been having allot of problems with a Asuscom USB ISDN modem. Mostly because of extremely poor drivers from the develeopers Asus (also sold as Dynalink and Askey). Bugfixes and new drivers came out almost daily for more than a year - lying in the box for the most part of a year waiting for a fix for the constant line drops).
: : : Finally updated to WinXP and seems allot more stable, but consumes HIGH (80-90%) CPU when using the onboard Via controller. Have a USB Creative Webcam Go (works ok) and a USB HP Scanner (Great scanner).
: : : I have no idea how to fix the resource problem - ended up getting a powered hub (no difference - still high CPU - webcam works better off it though).
: : : Purchased a CMD PCI USB card (supported native by XP) and running the modem off it now. It now consumes 20%-30% resources (much better but almost intollerable when using the Net).
: : : I've tested the modem on Intel based chipsets and it seems to function correctly - It does not consume any resources when plugged in Win2k/Me on my machine - only in WinXP.
: : : Could there be some problem with the USB minport interface with this modem in WinXP?
: : : The manufacturers blames my PC - but all my other USB devices works great -
: : : Any help is much welcome.
: : : Regards