Usbport.sys causes high DPC over time.

thanks. successfully fixed that issue, although according to latencymon, i still have bad latency from acpi.sys...

ben561 said:

thanks. successfully fixed that issue, although according to latencymon, i still have bad latency from acpi.sys...

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Never had any issues there so can't help you with that one unfortunatly.

OK FINALLY fixed this issue, there is a massive forum at Dell Studio 15/17/XPS & Other DPC spike issues - Workaround - Page 50 - NI User Forums that helped me out further.

you have to download process hacker, process explorer (another version) wouldnt allow me to suspend the acpi.sys

then once you SUSPEND the two driver threads - acpi.sys - then latencymon shows green along with green dpc latency checker. FINALLY