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 --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/20#issuecomment-18308881 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1