winbindd_cache.tdb size issue in 3.2.15

[valyekhin at aidoss.com]

Hello.

After update Samba from v. 3.0.28a to v.  3.2.15 we've noticed that  
winbibdd_cache.tdb file has been increased up to 10 times. After some  
testing we got the following file sizes (in bytes)

6 users in AD:  3.0.28a - 53248, 3.2.15 - 389120
1005 users in AD: 0.28a - 1802240, 3.2.15 - 13963264
10005 users in AD: 0.28a - 18464768, 3.2.15 - 144846848

We've found out that 3.2.15 uses another algorythm for making room for  
new records in the tdb file. If 3.0.28a allocates space for at least  
10 more records, 3.2.15 allocates space for at least 100 more records,  
and at least 25% more space.
We've created a patch which transfers algorythm for allocation space from
3.0.28a.
After using this patch we've got the next results:
6 users in AD:  3.0.28a - 53248, 3.2.15 patched - 61440
1005 users in AD: 0.28a - 1802240, 3.2.15 patched - 1922916
10005 users in AD: 0.28a - 18464768, 3.2.15 patched - 19709952

But we have some doubts as for the correctness of the patch and we're  
not sure that it won't damage anything.

Please, clarify this item.

Thanks...

Regards, Vladimir
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