Re: forcedeth: option to disable 100Hz timer (try 2)

[Robert Hancock]

Andrew Morton wrote:
> On Tue, 9 Sep 2008 23:34:35 +0400
> Mikhail Kshevetskiy <mikhail.kshevetskiy@xxxxxxxxx> wrote:
>
> > On some hardware no TX done interrupts are generated, thus special
> > 100Hz timer interrupt is required to handle this situation properly.
> > Other device do not require that timer interrupt feature. 
> >
> > Forcedeth has a DEV_NEED_TIMERIRQ flag to mark the broken devices.
> > Unfortunately, nobody know the actual list of broken devices, so all
> > device has this flag on. Other problem, this flag is not user visible,
> > so the kernel recompilation is required to disable timer interrupts and
> > test a device.
> >
> > This patch add a "disable_timerirq" option to disable interrupt 
> > timer mentioned above. This may be extremely useful for laptop users.
>
> Why do you feel that the timer-based completions need to be disabled? 
> Is it causing some problem?

100 unnecessary CPU wakeups per second imposes some power usage cost, 
especially on laptops with CPU C-states..

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