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? --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/20#issuecomment-25453321 ######################################################################## 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