buffered sql is blocking

[Sami Jorl]

Hi, 
After switching to buffered sql I noticed FreeRadius is still blocked if I lock the sql tables. 
So FreeRadius doesn't accept new requests and doesn't save them to the detail file until the tables are unlocked. 

AND all requests are timed out in NAS. 
Isn't the whole purpose of using this module to accept requests as fast as possible even when database is busy? 
Thanks 
Sam