Date: Fri, 29 Nov 2013 19:42:31 +0100 From: =?ISO-8859-1?Q?Ermal_Lu=E7i?= <eri@freebsd.org> To: Oleg Moskalenko <mom040267@gmail.com> Cc: freebsd-net <freebsd-net@freebsd.org>, Tim Kientzle <kientzle@freebsd.org>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: [PATCH] SO_REUSEADDR and SO_REUSEPORT behaviour Message-ID: <CAPBZQG0=bcHyv7aZse=WKfjk5=6D2-%2B6EQHiAaDZqGtaodhMMA@mail.gmail.com> In-Reply-To: <CALDtMrKvwXW-ou8X7zsKx2ST=dKD7FqHvvnQtGo30znTWU%2BVQQ@mail.gmail.com> References: <CAPBZQG29BEJJ8BK=gn%2Bg_n5o7JSnPbsKQ-=3=6AkFOxzt%2B=wGQ@mail.gmail.com> <4053E074-EDC5-49AB-91A7-E50ABE36602E@freebsd.org> <CALDtMrKvwXW-ou8X7zsKx2ST=dKD7FqHvvnQtGo30znTWU%2BVQQ@mail.gmail.com>
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Well seems Dragonfly has some version of it already from commit [1]. In FreeBSD there is the framework for this with by defining PCBGROUP. Also the explanation of it at [2] and [3]. It can achieve approximately the same features of SO_RESUSEPORT of linux. The only thing missing is the marketing behind it and i think and better RSS support. By looking at dates the support is there before linux so all you guys looking for it can experiment with it. What i was trying to accomplish was something else from performance improvement and maybe put a sysctl behind it to make it more acceptable.. [1] http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/740d1d9f7b7bf9c9c02= 1abb8197718d7a2d441c9 [2] http://fxr.watson.org/fxr/source/netinet/in_pcbgroup.c?im=3Dbigexcerpts#L51 [3] http://lists.freebsd.org/pipermail/svn-src-head/2011-June/028190.html On Fri, Nov 29, 2013 at 7:03 PM, Oleg Moskalenko <mom040267@gmail.com>wrote= : > Tim, you are wrong. Read what is "multicast" definition, and read how UDP > and TCP sockets work in Linux 3.9+ kernels. > > Oleg . > > > On Fri, Nov 29, 2013 at 9:59 AM, Tim Kientzle <kientzle@freebsd.org>wrote= : > >> >> On Nov 29, 2013, at 4:04 AM, Ermal Lu=E7i <eri@freebsd.org> wrote: >> >> > Hello, >> > >> > since SO_REUSEADDR and SO_REUSEPORT are supposed to allow two daemons = to >> > share the same port and possibly listening ip =85 >> >> These flags are used with TCP-based servers. >> >> I=92ve used them to make software upgrades go more smoothly. >> Without them, the following often happens: >> >> * Old server stops. In the process, all of its TCP connections are >> closed. >> >> * Connections to old server remain in the TCP connection table until the >> remote end can acknowledge. >> >> * New server starts. >> >> * New server tries to open port but fails because that port is =93still = in >> use=94 by connections in the TCP connection table. >> >> With these flags, the new server can open the port even though >> it is =93still in use=94 by existing connections. >> >> >> > This is not the case today. >> > Only multicast sockets seem to have the behaviour of broadcasting the >> data >> > to all sockets sharing the same properties through these options! >> >> That is what multicast is for. >> >> If you want the same data sent to all listeners, then >> that is multicast behavior and you should be using >> a multicast socket. >> >> > The patch at [1] implements/corrects the behaviour for UDP sockets. >> >> You=92re trying to turn all UDP sockets with those options >> into multicast sockets. >> >> If you want a multicast socket, you should ask for one. >> >> Tim >> >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >> > > --=20 Ermal
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