From owner-freebsd-questions Fri Oct 19 15:15:20 2001 Delivered-To: freebsd-questions@freebsd.org Received: from guru.mired.org (okc-65-31-203-60.mmcable.com [65.31.203.60]) by hub.freebsd.org (Postfix) with SMTP id 4184537B405 for ; Fri, 19 Oct 2001 15:15:18 -0700 (PDT) Received: (qmail 18486 invoked by uid 100); 19 Oct 2001 22:15:17 -0000 From: Mike Meyer MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15312.42485.787982.914840@guru.mired.org> Date: Fri, 19 Oct 2001 17:15:17 -0500 To: "David E. Cross" Cc: questions@freebsd.org Subject: Re: async isn't all that async? In-Reply-To: <18948746@toto.iv> X-Mailer: VM 6.90 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG David E. Cross types: > I was doing a profile recently between FreeBSD and Linux and I notice that > FreeBSD's -o async really isn't that async. Specifically the Linux operation > completed and then 15 seconds later the disk writes were committed, under > FreeBSD many of the operations seemed to be waiting on disk (I ktraced, > no mention of '-i sync' in anything... so no open options, to fcntl()s). > > Could someone shed a bit of light on this? Do you have softupdates enabled on the file system in question? If so, async in them mount request is ignored. http://www.mired.org/home/mwm/ Q: How do you make the gods laugh? A: Tell them your plans. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message