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On Fri, 28 Oct 2005 02:00 pm, Jesper Juhl wrote: > On 10/28/05, Lee Revell <rlrevell@joe-job.com> wrote: > > On Fri, 2005-10-28 at 03:31 +0100, Alistair John Strachan wrote: > > > On Friday 28 October 2005 00:18, Claudio Scordino wrote: > > > > Hi, > > > > > > > > during the last years there has been a lot of discussion about > > > > the "best" value of HZ... On i386 was 100, then became 1000, and > > > > finally was set to 250. I'm thinking to do an evaluation of this > > > > parameter using different architectures. > > > > > > > > Has anybody thought to give the possibility to modify the value of HZ > > > > at boot time instead of at compile time ? This would allow to easily > > > > test different values on different machines and create a table > > > > containing the "best" value for each architecture... At this moment, > > > > instead, we have to recompile the kernel for each different value :( > > > > > > > > Do you think there would be much work to do that ? > > > > Do you think it would be a desired feature the knowledge of the best > > > > value for each architecture with more precision ? > > > > > > Google for "dynticks". There's obviously an overhead associated with HZ > > > not being a constant (the compiler cannot optimise many expressions), > > > but the feature is being worked on nonetheless. > > > > Well Linus had the best idea in that thread (as usual) which was to > > implement "dynamic ticks" by leaving HZ a constant, setting it to a high > > value, and skipping ticks when idle. Has there been any work in that > > direction? > > i did a bit of work in that area, but the stuff I came up with never > seemed to work right, so I dropped it. It's all still in development at the moment but not far from being available again. We stood back a bit to make some structural changes before trying to make it ready for prime time. Cheers, Con - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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