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From: zemon@felix.UUCP (Art Zemon)
Newsgroups: comp.unix.ultrix
Subject: Re: out of mbuf
Message-ID: <10274@felix.UUCP>
Date: Fri, 23-Oct-87 13:04:09 EST
Article-I.D.: felix.10274
Posted: Fri Oct 23 13:04:09 1987
Date-Received: Mon, 26-Oct-87 00:48:30 EST
References: <8592@felix.UUCP>
Sender: zemon@felix.UUCP
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[The following arrived from an annonymous contributor.  They say that you
simply need a bigger mbuf pool and that this change will give it to
you.  If you only crash every couple of weeks then a value of 512 or
1024 ought to be sufficient.	-- AZ]


To keep the mbuf map from being exhausted you must increase the size
of the map. To do this you must edit 2 files and rebuild your kernel.
To make sure that the old files are not used you must do the following.
cd /sys/$MACHINE_NAME

    make clean	    # does a rm * in your system build dir.

in /sys/h edit mbuf.h you will find the following line. (it's around
line # 55)

    #define	NMBCLUSTERS	256

Change the 256 to either 512, 1024 or 2048, etc.  I recommend 1024.

Then edit /sys/vax/spt.s and you will find the following line ( it's
around line # 99 )

    SYSMAP(Mbmap	,mbutl		,NMBCLUSTERS*CLSIZE)

you MUST change NMBCLUSTERS to what you changed it to in mbuf.h

example

mbuf.h
    #define	NMBCLUSTERS	1024

spt.s
    SYSMAP(Mbmap	,mbutl		,1024*CLSIZE)