Re: 2.6.19-rc5: known regressions

[Tim Chen]

On Wed, 2006-11-08 at 22:10 -0700, Eric W. Biederman wrote:

> 
> Cool.  I'm glad to know it was simply a buggy lmbench.
> 
> What is sysconf(_SN_NPROCESSORS_ONLN) doing that it slows down as the
> number of irqs increase?  It is a slow path certainly but possibly
> something we should fix.  My hunch is cat /proc/cpuinfo...
> 

The increase in time of sysconf(_SN_NPROCESSORS_ONLN) call
is within "show_stat" function after looking at profiling data.  
There are a couple of loops that iterate over kstat_irqs 
interrupt statistics and depend on NR_IRQS.  Doesn't 
look like something we need to fix.

Tim
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