Date: Sun, 17 Feb 2002 17:25:17 -0800 (PST) From: "M. Warner Losh" <imp@village.org> To: paul@gromit.dlib.vt.edu Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Support for DAO in burncd under -STABLE?? Message-ID: <20020217.172517.117915195.imp@village.org> In-Reply-To: <Pine.OSF.4.41.0202171505150.30544-100000@gromit.dlib.vt.edu> References: <Pine.OSF.4.41.0202171505150.30544-100000@gromit.dlib.vt.edu>
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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...
Warner
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