漂在北方的狼

http://www.facebook.com/note.php?note_id=39391378919&id=9445547199&index=0

他们将修改也发布到github上了
http://github.com/fbmarc/facebook-memcached/tree/master

这个是他们现在能够达到的速率，每秒200,000 UDP请求，平均延时173微秒，总吞吐量达到每秒300,000UDP请求。
Since we’ve made all these changes, we have been able to scale memcached to handle 200,000 UDP requests per second with an average latency of 173 microseconds. The total throughput achieved is 300,000 UDP requests/s, but the latency at that request rate is too high to be useful in our system. This is an amazing increase from 50,000 UDP requests/s using the stock version of Linux and memcached.