Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3
From: Tony Lindgren (tony_at_atomide.com)
Date: 08/10/05
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Date: Wed, 10 Aug 2005 01:02:47 -0700 To: George Anzinger <george@mvista.com>
* George Anzinger <george@mvista.com> [050809 13:07]:
>
> >>I can take a shot at addressing these concerns in dynamic_tick patch, but
> >>it seems to me that VST has already addressed all these to a big extent.
> >>Had you considered VST before? The biggest bottleneck I see in VST going
> >>mainline is its dependency on HRT patch but IMO it should be possible to
> >>write a small patch
> >>to support VST w/o HRT.
> >>
> >>George, what do you think?
> >
> >
> >HRT + VST depend on APIC only, and does not use next_timer_interrupt().
>
> I convinced my self that the next_timer... code in timer.c misses timers
> (i.e. gives the wrong answer). I did this (after wondering due to
> performance) by scanning the whole timer list after I had the
> next_timer... answer and finding a better answer, not always, but some
> times. That code does not address the cascade list correctly.
Do you have a patch around for improving next_timer_interrupt()?
Tony
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