use 2 buf to speed up sendq; socket auto start.

lichao

2021-04-14 fa95ddd1a294ebad47cabf9e149ee7d789271044

 utest/speed_test.cpp

@@ -171,7 +171,7 @@
         }
         MsgI msg;
         BHMsgHead head;
         if (!cli.SyncRecv(msg, head, 100)) {
         if (!cli.SyncRecv(msg, head, 1000)) {
            printf("********** client recv error.\n");
         } else {
            DEFER1(msg.Release(shm));