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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:
416 epoll_ctl
2313 epoll_wait
10699 read
remote:
424 epoll_ctl
6537 epoll_wait
33895 read
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