Fix poor performance.

[Maxwell175]

The performance still has room to improve.

[Maxwell175]

Added debugging output on both client and server:

Client: https://github.com/MDTech-us-MAN/SSNFS/blob/master/SSNFS-client/fuseclient.cpp#L489

read  /zeros.tst : Ended handshake: 1
read  /zeros.tst : Sending data: 1
read  /zeros.tst : Waiting for reply: 1
read  /zeros.tst : Got first reply: 46
read  /zeros.tst : 131072 bytes Done: 48

Server: https://github.com/MDTech-us-MAN/SSNFS/blob/master/SSNFSd/ssnfsserver.cpp#L425

got 24 length bytes: 0
got 19 length bytes: 0
Done step 1: 0
Step 2 start: 45
got 10 length bytes: 0
Done step 2: 45
got 15 length bytes: 0
Done step 3: 45
got 16 length bytes: 0
Done step 4: 45

[Maxwell175]

It seems that the second message from client to server takes 43ms while the rest are are closer to 1ms. What's going on here?

[Maxwell175]

Fixed in commit 8dd0d1c!

[Maxwell175]

Problem has returned in commit 9effd3f.