On Wed, 4 Sep 2002, Dominic Marks wrote: DM> An mbuf is a fixed length structure which contains network data. DM> DM> An mbuf cluster is associated with an area of memory which is used for DM> storing more data than you can fit in a single mbuf. DM> DM> According the D&I 4.4 an mbuf is 128 bytes and (not all of this is DM> available for data storage), an mbuf cluster varies in size, but DM> defaults to 1024 bytes (but according to the book this may be different DM> depending on CPU architecture).
AFAIK according to /usr/src/sys/*/param.h, mbuf size if 256 (at least for i386, see /usr/src/sys/i386/include/param.h, and is not defined for Alphas); and mbcluster size defaults to 2k (I suppose the smallest 2^x to cover standard Ethernet frame) however, in /usr/src/sys/i386/boot/dosboot/param.h, MCLBYTES defined as 2^12 (4k). Don't know whether this value is really used. Sincerely, D.Marck [DM5020, DM268-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- [EMAIL PROTECTED] *** ------------------------------------------------------------------------ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-stable" in the body of the message
