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Date:      Tue, 28 Nov 2000 12:04:23 -0500 (EST)
From:      <joeo@cracktown.com>
To:        Andre Oppermann <oppermann@telehouse.ch>
Cc:        chat@freebsd.org
Subject:   Re: Netbsd advances...
Message-ID:  <Pine.LNX.4.04.10011281157370.7915-100000@ra.nks.net>
In-Reply-To: <3A23D953.A4C4FFD9@telehouse.ch>

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Yes, I know FreeBSD had a merged buffer cache for the 1.1.5 release and I
think everything after the 2.2 release.  Just nice to see that the end
user perceived performance of netbsd may finally get to the point where I
could stand to use it (especially on older hardware).

On Tue, 28 Nov 2000, Andre Oppermann wrote:

> 
> AFAIK FreeBSD does this for five years now... nothing new in little
> china.
> 
> joeo@cracktown.com wrote:
> > 
> > Just noticed this over on the netbsd home page...
> > 
> > UBC code integrated into NetBSD-current (27 Nov) (top)
> > 
> >      Chuck Silvers has integrated the Unified Buffer Cache project code
> > into NetBSD-current. To build a new -current kernel from an existing
> > kernel configuration file, you'll want to remove any settings for
> > "BUFCACHE", "NBUF", or "BUFPAGES", and let the size of the buffer cache go
> > back to the default. After that, you'll need to rerun config, and then you
> > can build away.
> > 
> >      Under UBC, the traditional buffer cache is no longer used for storing
> > regular data, only metadata, so you'll want to allow the VM system to
> > manage most of your physical memory. The default buffer cache size will be
> > fine for most people, regardless of the amount of memory in the machine.
> > 
> >      What does this mean for you? For most people, more memory will be
> > available for caching regular file data, so filesystem i/o will be faster
> > since there will be more times when the data you're accessing is already
> > in memory. How much faster depends on what you're doing, but you'll
> > probably notice the difference.
> > 
> >      More information is available in Chuck's announcement in the
> > current-users mail archive.
> > 
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> 



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