Date: Tue, 24 May 2005 09:41:32 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Matthias Buelow <mkb@incubus.de> Cc: freebsd-stable@freebsd.org Subject: Re: Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches) Message-ID: <20050524164131.GB62519@xor.obsecurity.org> In-Reply-To: <4293571C.1040109@incubus.de> References: <3248.172.16.0.199.1116876092.squirrel@172.16.0.1> <42924949.1070902@incubus.de> <20050523213155.GA46718@xor.obsecurity.org> <200505240922.42822.fcash@ocis.net> <4293571C.1040109@incubus.de>
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--3uo+9/B/ebqu+fSQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, May 24, 2005 at 06:32:28PM +0200, Matthias Buelow wrote: > Freddie Cash wrote: >=20 > > The laptop has an ATI IXP chipset, which means the HD is detected and r= un=20 > > as a generic UDMA33 device. The kernel is using the 4BSD scheduler wit= h=20 > > PREEMPTION enabled, all debugging hints disabled, and all the mpsafe=20 > > sysctls enabled. >=20 > Hmm.. maybe the disk (interface) is just too slow to trigger this when > running in UDMA33 (and a slow notebook disk).. I have observed it on a > SATA Seagate setup (on ICH6 chipset). Just a wild guess. I'd expect a slow disk to make worse the problem of blocking waiting for disk I/O. Kris --3uo+9/B/ebqu+fSQ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCk1k7Wry0BWjoQKURAo+cAJ0dbiSvfl8ZGdaOLvycxIZVLMxfVQCg+VTZ knVByZ4AuV88lyFu3rpT8dM= =zRcT -----END PGP SIGNATURE----- --3uo+9/B/ebqu+fSQ--
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