Date: Thu, 11 Jul 2002 16:11:23 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Bosko Milekic <bmilekic@unixdaemons.com> Cc: Juan Francisco Rodriguez Hervella <jrh@lab.it.uc3m.es>, freebsd-net@FreeBSD.ORG Subject: Re: mbuf external buffer reference counters Message-ID: <Pine.BSF.4.21.0207111610560.47612-100000@InterJet.elischer.org> In-Reply-To: <20020711171510.A19053@unixdaemons.com>
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On Thu, 11 Jul 2002, Bosko Milekic wrote: > > On Thu, Jul 11, 2002 at 11:00:56PM +0200, Juan Francisco Rodriguez Hervella wrote: > > First of all, let me say that Im newbie with these topics, > > I only know a bit about mbufs, but I dont understand how > > can an application trim away the refcount if the size is > > MCLBYTES = 2040 - sizeof(refcount). > > > > Don't this limit the room which an app. can write ? > > No. It just changes it. Also, it's not the application trimming away > anything, and the size is not 2040, it's 2048. :-) > > FWIW, the application has no idea about mbufs or clusters. These are > buffers and structures only the kernel knows about. except if you are trying to use 0 copy semantics. > > > Thanks. > > > > JFRH > > -- > Bosko Milekic > bmilekic@unixdaemons.com > bmilekic@FreeBSD.org > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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