On Thu, Mar 16, 2000, beldridg@best.com <beldridg@best.com> wrote:
> Sorry about the cross post but it seems to involve both linux-kernel and
> USB directly.
>
> Two questions:
>
> 1. When I'm on AC Power should kapmd clock down the CPU during idle time?
> It currently does and I don't think it should.
>
> 2. When I'm on battery power, this is what the CPU clock does:
>
> [beldridg@tool bin]$ while :; do ./mhz.estimate ; sleep 1; done;
> 100.409094 MHz processor.
> 268.379899 MHz processor.
> 364.733462 MHz processor.
> 266.247847 MHz processor.
> 267.976658 MHz processor.
>
> As activity increases, the speed increases. As activity decreases, the
> clock slows down to conserve power.
>
> However, if I insert the uhci module, the machine never clocks down:
>
> [root@tool /root]# insmod uhci
> Using /lib/modules/2.3.51/usb/uhci.o
>
> [beldridg@tool bin]$ while :; do ./mhz.estimate ; sleep 1; done;
> 364.733596 MHz processor.
> 364.733125 MHz processor.
> 364.733188 MHz processor.
> 364.733640 MHz processor.
Does the interrupt count go up at all? Check /proc/interrupts.
Also, try using usb-uhci to see if it's a driver issue.
JE
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This archive was generated by hypermail 2b29 : Thu Mar 23 2000 - 21:00:20 EST