Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site umcp-cs.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!think!harvard!seismo!umcp-cs!chris From: chris@umcp-cs.UUCP (Chris Torek) Newsgroups: net.unix-wizards Subject: Re: Help: socket buffer size Message-ID: <815@umcp-cs.UUCP> Date: Thu, 11-Jul-85 20:16:06 EDT Article-I.D.: umcp-cs.815 Posted: Thu Jul 11 20:16:06 1985 Date-Received: Sat, 13-Jul-85 12:06:37 EDT References: <400@cheviot.uucp> Organization: U of Maryland, Computer Science Dept., College Park, MD Lines: 20 > I am going to increase the size of socket buffers on 4.2BSD. > Before doing it, I would like to ask advice of wizards in netlands: > i) what is the limit of the socket buffer size? > ii) if I increase the size, does it affect the kernel operation? There isn't really *a* "socket buffer size". There are a bunch of places that have various "recvspace" and "sendspace" variables (look for calls to soreserve()). These can be increased (and in fact many of them have been increased in 4.3) without affecting much other than the number of mbufs in use. I have heard somewhere that increasing tcp_sendspace and tcp_recvspace above about 12K causes a crash, but I haven't seen it happen (then again we haven't been running "plain" 4.2 for a long time). You might have problems if they are >16K, since things like windows are kept in shorts and signs of differences determine whether one number is "greater" or "less" than another... but 4K is lots anyway. -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251) UUCP: seismo!umcp-cs!chris CSNet: chris@umcp-cs ARPA: chris@maryland