Increasing system message buffer size

[Andrew Robinson]

Thanks Dan!

Andrew

----- Original Message -----
From: Dan Nelson <dnelson at allantgroup.com>
Date: Monday, March 21, 2005 3:56 pm
Subject: Re: Increasing system message buffer size

> In the last episode (Mar 21), Andrew Robinson said:
> > I'm working on a problem that would benefit from verbose logging of
> > the boot process.  Unfortunately my logging is SO verbose that it
> > fills up the available system buffer.  I'm trying to figure out how
> > to change the buffer size.  I'm on 5.3 Stable.
> > 
> > It looks like one way to do it might be to recompile the kernel, 
> with 
> > 
> > options        	MSGBUF_SIZE=65536
> > 
> > set.  Is that the best way?  If so, what is the default size of the
> > buffer?  I checked NOTES in /usr/src/sys/i386/conf but couldn't find
> > any reference to it.
> 
> Yes, that's the only way to do it.  It might be possible to convert it
> into a tunable (which would let you set it in /boot/loader.conf), 
> but I
> don't know how early in the boot process tunables are available.  The
> default is 32768 (see /sys/sys/msbguf.h).
> 
> -- 
> 	Dan Nelson
> 	dnelson at allantgroup.com
>