Re: [gentoo-amd64] Choice of processor timer frequency?

[Barry.SCHWARTZ@chemoelectric.org]

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Peter Humphrey <prh@gotadsl.co.uk> skribis:
> It's just occurred to me to question this kernel configuration option, which 
> is under Processor Type and Features.
> 
> We used to have to choose from 100, 250 and 1000 Hz, but recently 300 Hz has 
> been added, with the following Help text:
> 
> ----
> CONFIG_HZ_300:
> 300 Hz is a good compromise choice allowing server performance while also 
> showing good interactive responsiveness even on SMP and NUMA systems and 
> exactly dividing by both PAL and NTSC frame rates for video and multimedia 
> work.
> ----
> 
> At first I followed the advice without thought, but on reflection it occurs 
> to me to wonder about the truth of this statement. I suspect it's only true 
> in North America, northern Japan and a few other places, where the public 
> supply frequency is 60 Hz. In the rest of the world, with its 50 Hz, I 
> think 250 would be a better choice.
> 
> I also think it would be more accurate to say "dividing exactly into" 
> than "by".
>
> Would anyone like to comment?

It should say 'divide by', and the frame rate is a property of the
television signal, not the power supply.


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Barry.SCHWARTZ ĉe chemoelectric punkto org  http://chemoelectric.org
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