From owner-freebsd-questions Thu Apr 22 15:45:57 1999 Delivered-To: freebsd-questions@freebsd.org Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by hub.freebsd.org (Postfix) with ESMTP id 4F90315454 for ; Thu, 22 Apr 1999 15:45:42 -0700 (PDT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.9.3/8.9.3) id RAA51294; Thu, 22 Apr 1999 17:43:02 -0500 (CDT) (envelope-from dan) Date: Thu, 22 Apr 1999 17:43:02 -0500 From: Dan Nelson To: Glenn Johnson Cc: mi@aldan.algebra.com, questions@FreeBSD.ORG Subject: Re: writing slower with SoftUpdates Message-ID: <19990422174301.B51036@dan.emsphone.com> References: <199904212008.QAA57336@misha.cisco.com> <19990422163120.A48347@dan.emsphone.com> <19990422172216.A552@symbion.srrc.usda.gov> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.3i In-Reply-To: <19990422172216.A552@symbion.srrc.usda.gov>; from "Glenn Johnson" on Thu Apr 22 17:22:16 GMT 1999 X-OS: FreeBSD 4.0-CURRENT Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In the last episode (Apr 22), Glenn Johnson said: > Interesting! I ran your script and found all three of my SCSI drives > had write caching enabled. Is it the same situation with IDE drives > and softupdates with regards to performance degradation? Most IDE drives don't even support command queueing and have such small internal buffers compared to equivalent SCSI drives (i.e. IBM's Deskstar 16gb IDE has a 512k cache, while the Ultrastar 18gb SCSI has a 2MB cache), so you're not going to see much of a decrease because of the write cache. -Dan Nelson dnelson@emsphone.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message