This change amortizes the cost of the lock acquisition over many packets and reduces lock contention significantly, allowing us to scale memcached to 8 threads on an 8-core system.

这个更正将请求锁的开销平摊到了多个数据包，显著地减少了锁争 用，这样我们就能在8核系统上将memcached伸展至8线程。