I have found something weird. It seems that blocking/non-blocking sockets has no impact on performance. However the O_NDELAY flag does:

```[root@lxfsrk59a06 install]# time xrdcopy -f root://lxfsrk59a03.cern.ch//var/tmp/testfile.0 /dev/null
[100%][==================================================] [5G/5G]

real 0m9.236s
user 0m0.091s
sys 0m8.893s```

```[root@lxfsrk59a06 install]# time xrdcopy -f root://lxfsrk59a03.cern.ch//var/tmp/testfile.0 /dev/null
[100%][==================================================] [5G/5G]

real 0m6.327s
user 0m0.022s
sys 0m3.062s```

Any ideas why the Nagle's algorithm is influencing read speed?

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