stevedrew commented on issue #1409: Network performance issue (30 secs for 8mb PUT) URL: https://github.com/apache/couchdb/issues/1409#issuecomment-399783183 OK good news found solution to performance issue. Turns out the recbuf setting is the cause. I had to comment out the recbuf param in mochiweb/mochiweb_socket_server.erl and then the time to put a 10 MB text file went from 1 min 29 seconds to < 1 second !! **Could this be the cause of all the complaints about how slow couchdb is for attachments?** I believe not setting recbuf on linux then allows the operating system to handle it more efficiently. (When set it seems to be causing some tcp window size performance issues that lead to the huge delay for larger PUTs.) I also found this PR https://github.com/mochi/mochiweb/issues/153 to fix mochiweb to allow an "undefined" setting for recbuf, but couchdb 2.1.1 is not using this version, I tried using this version with couchdb but couchdb did not seem to allow undefined as a param to recbuf in the ini file. So it would seem like we need couchdb to support setting recbuf to undefined, maybe even having that a the default? Thanks, Steve.
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