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Stevens (http://www.unpbook.com/) says on page 209: > The receive low-watermark is the amount of data that must be in the socket receive buffer for ```select``` to return "readable." Unfortunately, Linux manual page says: > ```SO_RCVLOWAT``` and ```SO_SNDLOWAT``` > Specify the minimum number of bytes in the buffer until the socket layer will pass the data to the protocol > ```SO_SNDLOWAT```) or the user on receiving (```SO_RCVLOWAT```). These two values are initialized to 1. > ```O_SNDLOWAT``` is not changeable on Linux (```setsockopt(2)``` fails with the error ```ENOPROTOOPT```). > ```SO_RCVLOWAT``` is changeable only since Linux 2.4. The ```select(2)``` and ```poll(2)``` system calls currently > do not respect the ```SO_RCVLOWAT``` setting on Linux, and mark a socket readable when even a single byte > of data is available. A subsequent read from the socket will block until ```SO_RCVLOWAT``` bytes are available. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/20#issuecomment-18354444 ######################################################################## 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