Date: Mon, 17 Apr 2000 10:29:37 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Rahul Siddharthan <rsidd@physics.iisc.ernet.in> Cc: Rasmus Skaarup <rasmus@gal.dk>, freebsd-questions@FreeBSD.ORG Subject: Re: disc io - sync and async Message-ID: <20000417102936.H4381@fw.wintelcom.net> In-Reply-To: <20000417221637.A407@theory1.physics.iisc.ernet.in>; from rsidd@physics.iisc.ernet.in on Mon, Apr 17, 2000 at 10:16:37PM %2B0530 References: <20000416120315.W4381@fw.wintelcom.net> <Pine.BSF.4.21.0004171300150.10236-100000@skaarup.org> <20000417185653.A7455@theory6.physics.iisc.ernet.in> <20000417084552.E4381@fw.wintelcom.net> <20000417221637.A407@theory1.physics.iisc.ernet.in>
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* Rahul Siddharthan <rsidd@physics.iisc.ernet.in> [000417 10:23] wrote: > Alfred Perlstein said on Apr 17, 2000 at 08:45:52: > > As far as making softupdates the default, again you haven't read > > everything you're supposed to: > > > > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/ufs/ffs/README.softupdates?rev=1.7 > > I think the question was on making async mounts the default > (linux-style). The FreeBSD mount manpage warns against doing this; > the linux manpage doesn't. (Unsurprising, since it's the default in > linux). > > Also, Rasmus's earlier benchmarks suggest that FreeBSD's performance > is 1/4 that of linux on the same hardware. Is that typical, or some > freak of that particular hardware setup? How much of that can be > compensated by softupdates (the README suggests a performance gain of > 20% less running time and 40% less I/O)? Is there something > especially dangerous about a FreeBSD async mount, or is the manpage > merely being more "honest" than the linux manpage? When filesystem > performance is important (say a heavy-duty mail server, or NFS > server), and power/hardware-related crashes are not a worry and backup > precautions have been taken, what would you recommend doing? Drawing your own conclusions from the email I posted. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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