Re: [RFC][PATCH] linux-2.4.23-pre9_ia64-cyclone_A0

From: john stultz <johnstul_at_us.ibm.com>
Date: 2003-11-18 12:08:40
On Mon, 2003-11-17 at 17:02, john stultz wrote:
> On Mon, 2003-11-17 at 16:23, Bjorn Helgaas wrote:
> > SGI uses a similar design in 2.4, but apparently there are some
> > issues with it:
> > 	http://www.gelato.unsw.edu.au/linux-ia64/0310/6973.html
> > 
> > I'd like to see those issues resolved and the Cyclone support
> > put into the same framework as the SGI work.
> 
> Hmmm. I think I've grasped the issue there. It seems the problem is not
> calculating the equivalent of delay_at_last_interrupt found in the i386
> time code. I'll see if I cannot come up with something similar.

Actually, on second though, I don't believe this is necessary as every
tick we increment last_tick_cyclone by one tick, rather then zeroing it
out. In that way, even if the interrupt is delayed we don't lose time. 

I may be missing some subtlety, but I think the point made above was
considered in my patch. 

thanks
-john


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Received on Mon Nov 17 20:14:31 2003

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