Date: Tue, 20 Aug 2002 16:07:14 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Julian Elischer <julian@elischer.org> Cc: freebsd-net@FreeBSD.ORG Subject: Re: m_getcl and end-to-end performance Message-ID: <15714.41330.135614.44197@grasshopper.cs.duke.edu> In-Reply-To: <Pine.BSF.4.21.0208201254060.52191-100000@InterJet.elischer.org> References: <15714.40341.115512.786712@grasshopper.cs.duke.edu> <Pine.BSF.4.21.0208201254060.52191-100000@InterJet.elischer.org>
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Julian Elischer writes:
> > Yes, it checks that M_EXT_WRITABLE(m) is true before adding it to the pool.
>
> Are only Cluster mbufs writable?
Yes. At least in -stable:
#define M_EXT_WRITABLE(m) \
((m)->m_ext.ext_free == NULL && mclrefcnt[mtocl((m)->m_ext.ext_buf)] == 1)
Drew
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