On Wed, 3 Oct 2007, Alan Jenkins wrote: > So if I want to find out why ehci causes more wakeups on an idle system > than uhci, I need to break down the ehci_watchdog timer into its > component uses.
One other thing I forgot to mention. As you know, ehci-hcd's extra interrupts tell the driver it can disable DMA. But uhci-hcd never disables DMA as long as any active devices are plugged into the controller. The hardware doesn't permit it. So even though uhci-hcd's overall interrupt count may be lower, it forces the CPU to stay out of the deep sleep states that ehci-hcd allows for. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
