Messages in this thread | | | Subject | Re: [PATCH] x86: Reduce the default HZ value | From | Alok Kataria <> | Date | Thu, 07 May 2009 09:37:50 -0700 |
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On Thu, 2009-05-07 at 08:14 -0700, Alan Cox wrote: > On Thu, 7 May 2009 10:13:52 -0400 (EDT) > Christoph Lameter <cl@linux.com> wrote: > > > I think we need to reduce the general tick frequency to be as low as > > possible. With high resolution timers the tick frequency is just the > > frequency with which the timer interrupt disturbs a running application. > > > > Are there any benefits remaining from frequent timer interrupts? I would > > think that 60 HZ would be sufficient. > > 50 works for various european video apps, 60 breaks, 60 works for various > US video apps, 50 breaks. Now that may have changed with all the select > stuff being hrtimer based (which I'd missed).
I would have assumed whatever timeout mechanism the video apps use should have already been converted to hrtimers ? Or are you saying that they use select stuff which is already hrtimer based and so there shouldn't be any problem now for video apps ?
> > The tick also still appears to be involved in ntp and in cpu stats where > a 50Hz tick would mean only 25Hz accuracy on CPU usage etc >
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