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If I run xrdcopy on the XRootD server  itself I transfer 4.000.000.000 bytes in 3.6s with much less system time
real	0m3.566s
user	0m0.189s
sys	0m1.987s

From a remote client:
real	0m4.801s
user	0m0.172s
sys	0m3.931s

The main difference looking at strace is:
local:
<#>  <syscall>
--------------------------
416      epoll_ctl
2313    epoll_wait
10699   read

remote:
<#>  <syscall>
-------------------------
424      epoll_ctl
6537    epoll_wait
33895  read







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