Date: Fri, 29 Nov 2013 20:01:26 +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: <CAPBZQG2Pb1683xevxwLwFzK03ea6GrMAPkuxqWAU16aFwCFDbQ@mail.gmail.com> In-Reply-To: <CAPBZQG2Ou1btHZdsYYEh9-pz%2BgrgpPG3a6VPEkj8Ygguh=Q4VQ@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> <CAPBZQG0=bcHyv7aZse=WKfjk5=6D2-%2B6EQHiAaDZqGtaodhMMA@mail.gmail.com> <CAPBZQG2Ou1btHZdsYYEh9-pz%2BgrgpPG3a6VPEkj8Ygguh=Q4VQ@mail.gmail.com>
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And some better marketing from Dragonfly about it http://forum.nginx.org/read.php?29,241283,241283 :) On Fri, Nov 29, 2013 at 7:55 PM, Ermal Lu=E7i <eri@freebsd.org> wrote: > Also some discussions and improvements to it. > > http://unix.derkeiler.com/Mailing-Lists/FreeBSD/net/2013-09/msg00165.html > > > On Fri, Nov 29, 2013 at 7:42 PM, Ermal Lu=E7i <eri@freebsd.org> wrote: > >> 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/740d1d9f7b7bf9c9= c021abb8197718d7a2d441c9 >> [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.htm= l >> >> >> On Fri, Nov 29, 2013 at 7:03 PM, Oleg Moskalenko <mom040267@gmail.com>wr= ote: >> >>> 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>wro= te: >>> >>>> >>>> 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 daemon= s >>>> 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 =93stil= l >>>> 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 th= e >>>> 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" >>>> >>> >>> >> >> >> -- >> Ermal >> > > > > -- > Ermal > --=20 Ermal
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