Date: Fri, 29 Jul 2005 16:44:52 +0200 From: Marc Olzheim <marcolz@stack.nl> To: Julian Elischer <julian@elischer.org> Cc: Pawel Jakub Dawidek <pjd@FreeBSD.org>, FreeBSD Current <freebsd-current@FreeBSD.org>, re@FreeBSD.org, Giorgos Keramidas <keramida@FreeBSD.org> Subject: Re: 6.0 VFS/VM over-runs. Was: Apparent strange disk behaviour in 6.0 Message-ID: <20050729144452.GA95803@stack.nl> In-Reply-To: <42E94A88.4010603@elischer.org> References: <42E88135.30603@elischer.org> <42E88F2B.5000108@elischer.org> <20050728082844.GW46538@darkness.comp.waw.pl> <42E898A6.6010803@elischer.org> <20050728115251.GA20091@beatrix.daedalusnetworks.priv> <20050728135613.GD46538@darkness.comp.waw.pl> <42E93EE1.2090009@elischer.org> <42E94310.20806@samsco.org> <42E94A88.4010603@elischer.org>
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--VbJkn9YxBvnuCH5J Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 28, 2005 at 02:13:44PM -0700, Julian Elischer wrote: > mount a large partition that has some room.. hopefully several times=20 > the space of all RAM. > . >=20 > do: >=20 > dd if=3D/dev/zero of=3D/${mountpoint}/bigfile bs=3D128k count=3D1000000 &= iostat 1 >=20 >=20 > notice that dd dies with "not enough swapspace" after some number of=20 > seconds. > (there is no swap attached). also notice that until the crash, IO speed= =20 > was max for the > disk. >=20 > then add swap and do it again. >=20 > notice that at teh point where dd previously crashed, the swap disk > springs into life and disk IO on your main disk goes into the toilet. > notice that dd gets swapped out. (!!!!) >=20 > when the disk recovers enough, dd pages back in and creates more IO but= =20 > in teh mean time there is no IO > going on to the disk.. (watch the LEDs). Just to be clear, this happens on 5-STABLE, 6-STABLE and 7-CURRENT. Marc --VbJkn9YxBvnuCH5J Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFC6kDkezjnobFOgrERAskDAJ99ScNnRXHvY9yV5zoTqVILNNfcdwCgp0w1 UqjNyxVmoVnOJumMIwqO7Os= =0XCG -----END PGP SIGNATURE----- --VbJkn9YxBvnuCH5J--
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