comparission between fsfs and bdb subversion backands

Could someone provide some real world numbers on medium( or large)
size repository performance which compares fsfs and bdb backends ?

as for now i see this differences:
fsfs+ no write access needed for anonymous readonly access (bdb requires it)
fsfs+ no berkleydb dependency
fsfs- new, not extensively tested

i'm interested in:
1) performance info
2) repository size (for medium..large repositories)
3) speed differences

-- 
radoslaw.
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