Re: RT patch acceptance

[Andi Kleen]

On Tue, May 31, 2005 at 06:48:50AM -0400, James Bruce wrote:
> P.S. Preempt-RT is a sight to behold while updatedb is running.  The 
> difference between it and ordinary preempt is quite impressive.  Nothing 
> currently running has so much as a hiccup, even though / is using the 
> non-latency-friendly ReiserFS.  The only way I even notice updatedb is 
> running at all is through my CPU monitor and the fact that disk IO is 
> slower.

Are you sure it is not only disk IO? In theory updatedb shouldn't 
need much CPU, but it eats a lot of memory and causes stalls 
in the disk (or at least that was my interpration on the stalls I saw)
If there is really a scheduling latency problem with updatedb
then that definitely needs to be fixed in the stock kernel.

-Andi
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