Date: Sat, 5 May 2001 19:16:39 -0500 From: Jonathan Lemon <jlemon@flugsvamp.com> To: Archie Cobbs <archie@dellroad.org> Cc: Jonathan Lemon <jlemon@flugsvamp.com>, tlambert@primenet.com, current@FreeBSD.ORG Subject: Re: panic in fxp driver Message-ID: <20010505191639.N670@prism.flugsvamp.com> In-Reply-To: <200105052304.f45N4RO00676@arch20m.dellroad.org> References: <200105031828.f43ISSi06097@prism.flugsvamp.com> <200105052304.f45N4RO00676@arch20m.dellroad.org>
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On Sat, May 05, 2001 at 04:04:27PM -0700, Archie Cobbs wrote: > Jonathan Lemon writes: > > >Please consider the case where there are two mbuf chains being > > >transmitted, which look like this: > > > > Um. "Not Possible". > > I thought m_copypacket() of a cluster mbuf would yield exactly > this situation (two headers pointing to the same data region). Well, only external mbufs can be shared, not mbuf chains; and clusters are accessed through the (unused) mbuf that comprises the chain. I believe Terry may have been referring to some local modifications that is in his code, which permits the scenario he describes. -- Jonathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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