* Jerry Toung ([EMAIL PROTECTED]) wrote: > Giovani, > > you will find the answer to your question in "tcp/ip illustrated, volume 2: > the implementation" in chapter 2. > > But to briefly answer your question, yes, there are 4 different types of > mbufs, depending on the m_flags value. > 1) m_flags = 0 and mbuf contains only data up to 108 bytes. > 2) m_flags = M_PKTHDR to designate a packet header. > 3)m_flags = M_EXT. In a situation where a user process write() in a buffer > > 256 bytes, the system allocates a cluster to hold that data. > 4) m_flags = M_EXT|M_PKTHDR > > and yes when using clusters, the memory in the mbuf is unsed. > > hop that helped.
Thank you very much Justin and Jerry for the answers. They were very helpful. I'm already getting my copy of Steven's :-) -- Giovanni P. Tirloni <gpt at tirloni.org> Fingerprint: 8C3F BEC5 79BD 3E9B EDB8 72F4 16E8 BA5E D031 5C26 _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
