Just to add a data point (and sorry, I can't find where someone was talking 
about numbers in the thread)...

For a while earlier this year we were running a 3.x kernel and saw a very 
modest (1-2%) improvement in overall performance. This would be on a server 
with 512G RAM running ext4.
Jim C. Nasby, Data Architect                       j...@nasby.net
512.569.9461 (cell)                         http://jim.nasby.net

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