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Date:      Wed, 27 Apr 2005 21:37:24 +0200
From:      Marc Olzheim <marcolz@stack.nl>
To:        Brian Fundakowski Feldman <green@freebsd.org>
Cc:        freebsd-stable@freebsd.org
Subject:   [5.3Rp6] UFS buffer cache deadlock (was: NFS client/buffer cache deadlock)
Message-ID:  <20050427193724.GF6256@stack.nl>
In-Reply-To: <20050427081746.GA66441@stack.nl>
References:  <16998.36437.809896.936800@khavrinen.csail.mit.edu> <20050420173859.GA99695@stack.nl> <20050426140701.GB5789@green.homeunix.org> <20050426151751.GB68038@stack.nl> <20050426155043.GC5789@green.homeunix.org> <20050426160609.GA68511@stack.nl> <20050426162549.GD5789@green.homeunix.org> <20050426164346.GA68763@stack.nl> <20050426193602.GE5789@green.homeunix.org> <20050427081746.GA66441@stack.nl>

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On Wed, Apr 27, 2005 at 10:17:46AM +0200, Marc Olzheim wrote:
> > > Btw. running the writev program with 20 * 100 MB on UFS on a 512MB
> > > FreeBSD 6-CURRENT system practicly locks the filesystem down _and_
> > > causes all processes to be swapped out in favor of the buffer cache.
> > > 'top' however, doesnt' show a rise in BUF usage.
> > >=20
> > > On FreeBSD 4.x, the system performance as usual during the writev to
> > > UFS.
> >=20
> > That's certainly not very optimal.  I don't know anything about it, sor=
ry.
>=20
> No problem. I just thought that they might be related (this is with a
> single writev() as well).

Hmm, doing the 20 * 100MB on a 5.3-RELEASE-p6 system with 256 MB memory
and 512MB swap (on UFS) hangs the machine. Luckily, I cannot reproduce
it on 5.4-STABLE :-/

Marc

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