Date: Tue, 24 May 2005 18:32:28 +0200 From: Matthias Buelow <mkb@incubus.de> To: Freddie Cash <fcash@ocis.net> Cc: freebsd-stable@freebsd.org Subject: Re: Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches) Message-ID: <4293571C.1040109@incubus.de> In-Reply-To: <200505240922.42822.fcash@ocis.net> 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>
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Freddie Cash wrote: > The laptop has an ATI IXP chipset, which means the HD is detected and run > as a generic UDMA33 device. The kernel is using the 4BSD scheduler with > PREEMPTION enabled, all debugging hints disabled, and all the mpsafe > sysctls enabled. 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. mkb.
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