Date: Wed, 9 Apr 2008 08:58:11 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Ferruccio Zamuner <nonsolosoft@diff.org> Cc: freebsd-geom@freebsd.org Subject: Re: gmirror on a very slow but new HP architecture Message-ID: <20080409065811.GA20138@garage.freebsd.pl> In-Reply-To: <47FA6C65.1010007@diff.org> References: <47F92BD9.1060207@diff.org> <47F9489C.7040602@quip.cz> <47FA6C65.1010007@diff.org>
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--a8Wt8u1KmwUX3Y2C Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Apr 07, 2008 at 08:48:05PM +0200, Ferruccio Zamuner wrote: > free# swapoff /dev/mirror/gm0b > free# dd if=3D/dev/zero of=3D/dev/mirror/gm0b bs=3D8192 count=3D10000 > 10000+0 records in > 10000+0 records out > 81920000 bytes transferred in 2.443927 secs (33519822 bytes/sec) > free# dd if=3D/dev/mirror/gm0b of=3D/dev/null bs=3D8192 count=3D20000 > 20000+0 records in > 20000+0 records out > 163840000 bytes transferred in 7.773088 secs (21077852 bytes/sec) > free# dd if=3D/dev/mirror/gm0b of=3D/dev/null bs=3D8192 count=3D20000 > 20000+0 records in > 20000+0 records out > 163840000 bytes transferred in 7.444171 secs (22009167 bytes/sec) > free# dd if=3D/dev/zero of=3D/dev/mirror/gm0b bs=3D8192 count=3D20000 > 20000+0 records in > 20000+0 records out > 163840000 bytes transferred in 5.668771 secs (28902208 bytes/sec) > free# dd if=3D/dev/mirror/gm0b of=3D/dev/null bs=3D8192 count=3D20000 > 20000+0 records in > 20000+0 records out > 163840000 bytes transferred in 8.050144 secs (20352430 bytes/sec) Your test is too short and you are using too small block size. Try something like this: # dd if=3D/dev/zero of=3D/dev/mirror/gm0b bs=3D128k count=3D10000 # dd if=3D/dev/mirror/gm0b of=3D/dev/null bs=3D128k count=3D10000 Also, please provide the output of: # bsdlabel /dev/mirror/gm0 so we know 'b' partition is not placed at the end of the disk. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --a8Wt8u1KmwUX3Y2C Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFH/GkAForvXbEpPzQRAqq7AJ0TKBO7QkdlKhTY7i89d5sC32fQnQCfQYrX HIXqohhoZ6XQcGvhUe2e99M= =12zY -----END PGP SIGNATURE----- --a8Wt8u1KmwUX3Y2C--
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