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Re: [ts-7000] Re: high resolution timers and real time

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Subject: Re: [ts-7000] Re: high resolution timers and real time
From: Peter Gammie <>
Date: Thu, 21 Jan 2010 10:15:28 +1100
Charles,

On 19/01/2010, at 12:37 PM, Charles wrote:

> --- In  Peter Gammie <> wrote:
> > Are Matthieu's patches hosted anywhere except in the Yahoo file 
> 
> Sure, they are at http://mcrapet.free.fr/
> He's up to 2.6.32.3, but doesn't have HRT yet AFAIK. Search this group 
> archive for '10ms' to gauge interest, it's come up many times before :)

Ok, ok, I can take a hint. :-) I'll try to look into it later this month.

I tried 2.6.32.3 with Matthieu's patch on the ts7260 I have, and couldn't get 
it to boot. (It just hangs after uncompressing the kernel.) I also tried adding 
the "mem= mem= mem= mem=" stuff to no avail.

Has anyone had any success with it?

> You might have better luck *without* the -rt patch, ironically. That intends 
> to have deterministic latencies, but not necessarily the lowest. Try just the 
> normal config-preempt from the vanilla kernel (but with HRT of course). You 
> don't have the PM stuff enabled in Matt's patches do you? If there's anything 
> you don't need (USB, ethernet, serial, etc), take it out.

Thanks for the RT pointers, I'll try them out.

I think I'd be happy with deterministic delays - I want the multiplexing scan 
to be regular, independent of load. I'll try twiddling the other options as you 
suggest.

cheers
peter

-- 
http://peteg.org/

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