mainline: don't arrange too much buffer units
mainline: don't arrange too much buffer units

chucklu/SuperSocket,ZixiangBoy/SuperSocket,fryderykhuang/SuperSocket,ZixiangBoy/SuperSocket,fryderykhuang/SuperSocket,fryderykhuang/SuperSocket,chucklu/SuperSocket,jmptrader/SuperSocket,kerryjiang/SuperSocket,chucklu/SuperSocket,ZixiangBoy/SuperSocket,kerryjiang/SuperSocket,mdavid/SuperSocket,memleaks/SuperSocket,jmptrader/SuperSocket,mdavid/SuperSocket,jmptrader/SuperSocket,mdavid/SuperSocket