使用eventlet之后反而性能更差的一组测试例子，求解为什么是这样？

刚刚了解到这个类库，据说是个并发网络场景下非常高性能的模块
我自己写了个代码做了个测试，反而比直接使用多threading SocketServer模块更慢，是我用的有问题吗？求高手指教
我做了4组测试，分别是服务端使用/不使用eventlet 客户端使用/不使用eventlet的组合测试，结果是都不使用eventlet的一组情况最好，还请各位指教~

服务端代码

#import eventlet

#eventlet.monkey_patch()
#from eventlet.green import SocketServer
from SocketServer import TCPServer,StreamRequestHandler,ThreadingMixIn,UnixStreamServer,BaseServer
import os

class myserver(ThreadingMixIn, TCPServer):
#class myserver(ThreadingMixIn, UnixStreamServer):
    request_queue_size = 8192
    allow_reuse_address = True

    def _remove_socket(self):
        pass
        try:
            os.remove(self.server_address)
        except OSError:
            pass

    def server_bind(self):
        #self._remove_socket()
        TCPServer.server_bind(self)

    def shutdown(self):
        TCPServer.shutdown(self)
        self.server_close()
        self._remove_socket()


class requesthandler(StreamRequestHandler):
    def handle(self):
        req = ''
        while True:
            chunk = self.rfile.readline()
            if not chunk:
                break
            req += chunk
            if chunk == '\r\n':
                break
        data = 'Hello World\r\n'
        self.wfile.write('HTTP/1.1 200 OK\r\nContent-Length: %d\r\n\r\n%s'%(len(data),data))



def main():
    #addr = './123.sock'
    addr = ('127.0.0.1', 81)
    try:
        server = myserver(addr,requesthandler) 
        print server
        server.serve_forever(0.1)
    except KeyboardInterrupt:
        server.shutdown()

main()

客户端代码

#import eventlet
#eventlet.monkey_patch()
import threading

import blist,socket

jobs = blist.blist([])

def a():
    for i in xrange(100):
        s = socket.socket()
        s.connect(('127.0.0.1',81))
        #s = socket.socket(socket.AF_UNIX)
        #s.connect('./123.sock')
        s.sendall('\r\n')
        data = ''
        ret = s.recv(1)
        while True:
            if ret:
                data += ret
                ret = s.recv(1)
            else:
                s.close()
                break
                
cc = 300 
for i in xrange(cc):
    jobs.append(threading.Thread(target = a))

for i in xrange(cc):
    jobs[i].start()
for i in xrange(cc):
    jobs[i].join()

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