Messages in this thread | | | Date | Thu, 7 May 2009 10:09:56 -0400 (EDT) | From | Christoph Lameter <> | Subject | Re: [PATCH] x86: Reduce the default HZ value |
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On Tue, 5 May 2009, Alan Cox wrote:
> HZ on a tickless system has no meaningful relationship to wakup rates - > which are what I assume you actually care about.
Linux is not tickless. It only switches off ticks if a processor is idle.
> So do you want to change the precision of poll() and other > functionality ? or do you want to change the wakeup rates and > corresponding virtualisation overhead ?
select and poll use timeouts based on high resolution timers.
> What measurements have you done that make you think HZ is relevant in a > tickless kernel ?
Just reading the code gets you there.
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