speeding up string_to_sid

[Gerald (Jerry) Carter]

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Jim McDonough wrote:
> We've got a customer hitting the CPU wall on winbind, and a big 
> factor in it is the string_to_sid() code
...
> So for a million lookups, that's the difference.  And this customer is 
> getting a tremendous rate of lookups...
> 
> Think i should check this in?  Or some variant?

The patch looks good to me.  If you could s/memset/ZERO_STRUCTP/
and then fix the outdated comments to 'ia', that would be good.






cheers, jerry
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