Date: Mon, 5 Sep 2016 05:47:22 -0700 From: Maxim Sobolev <sobomax@freebsd.org> To: FreeBSD Net <freebsd-net@freebsd.org>, Gleb Smirnoff <glebius@freebsd.org> Subject: Re: Which UDP sockets the incoming packet is delivered to when both wildcard and non-wildcard listeners are present Message-ID: <CAH7qZfsUOnpQKj0V4sv7ws%2BbSmgK3V-1bSA1UUVp49UFTxWQuw@mail.gmail.com> In-Reply-To: <CAH7qZfvZ63rcNhrwzMzbTkB8S-F%2Bk1FF=0vXvgwd%2BqGPSyA%2BcQ@mail.gmail.com> References: <CAH7qZfvZ63rcNhrwzMzbTkB8S-F%2Bk1FF=0vXvgwd%2BqGPSyA%2BcQ@mail.gmail.com>
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P.S. Destination UDP address of the message in question is obviously X.Y.Z.W:5071. On Mon, Sep 5, 2016 at 5:42 AM, Maxim Sobolev <sobomax@freebsd.org> wrote: > Hi Netters, > > Suppose we have two threads in the system both bound to a same specific > UDP port, one using INADDR_ANY and another one using actual IP. When > incoming message arrives to that port is there any guarantee as to which of > those two threads going to see the message? The question has arisen from > the observation that most of the time the thread that is bound to a > specific IP gets them, but occasionally we see INADDR_ANY-bound thread > receiving few packets as well. So that behavior seems to be "almost > deterministic" and we are wondering where that "almost" part is expected or > some kind of socket matching bug? > > OS in question is 10.3-RELEASE-p5 > > [ssp-root@dal23 ~]$ sockstat | grep 24421 | grep udp4 | grep -w 5071 > b2bua python2.7 24421 7 udp4 *:5071 *:* > b2bua python2.7 24421 58 udp4 X.Y.Z.W:5071 *:* > > I apologize if this is answered somewhere already, any pointers would be > appreciated. Thanks! > > -Max >
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