Date: Thu, 5 Sep 2002 02:04:05 +0400 (MSD) From: Dmitry Morozovsky <marck@rinet.ru> To: Dominic Marks <dominic_marks@btinternet.com> Cc: Mike Hoskins <mike@adept.org>, Charles Sprickman <spork@inch.com>, <stable@FreeBSD.ORG> Subject: Re: interpreting netstat -m output Message-ID: <20020905014934.J56943-100000@woozle.rinet.ru> In-Reply-To: <20020904212032.GA1688@gallium>
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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 --- marck@rinet.ru *** ------------------------------------------------------------------------ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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