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Date:      Mon, 18 Feb 2002 16:05:06 +0100
From:      Cliff Sarginson <csfbsd@raggedclown.net>
To:        freebsd-stable@FreeBSD.ORG
Subject:   Re: Support for DAO in burncd under -STABLE??
Message-ID:  <20020218150506.GB863@raggedclown.net>
In-Reply-To: <20020217.172517.117915195.imp@village.org>
References:  <Pine.OSF.4.41.0202171505150.30544-100000@gromit.dlib.vt.edu> <20020217.172517.117915195.imp@village.org>

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On Sun, Feb 17, 2002 at 05:25:17PM -0800, M. Warner Losh wrote:
> In message: <Pine.OSF.4.41.0202171505150.30544-100000@gromit.dlib.vt.edu>
>             Paul Mather <paul@gromit.dlib.vt.edu> writes:
> : After a little more research, I found that DAO is supported in burncd
> : under 5.0-CURRENT.  However, after briefly installing FreeBSD from the
> : 5.0-20020214-CURRENT snapshot, I reverted back to 4.5-RELEASE because my
> : I/O performance under -CURRENT appeared to be about 1/3rd of that under
> : 4.5-RELEASE (measured by install and dump progress).  (Did I pick a bad
> : snapshot to install??)
> 
> Likely you had a kernel that had WITNESS enabled.  That's a huge
> performance killer.  However, we're at the worst part of the lock
> pushdown right now, so there's about a 15-20% performance hit
> (measured by make buildworld, aka the "worldstone").  Things should be
> getting better from this point forward...
> 
Oh, that explains it (although I don't know what WITNESS is), I rebuilt
CURRENT yesterday, in the time it took I translated Lord of the Rings
into mediaeval Church Latin.

-- 
Regards
   Cliff Sarginson -- <csfbsd@raggedclown.net>

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