From owner-freebsd-performance@FreeBSD.ORG Wed May 16 17:07:29 2007 Return-Path: X-Original-To: freebsd-performance@freebsd.org Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 257D716A403 for ; Wed, 16 May 2007 17:07:29 +0000 (UTC) (envelope-from lydianconcepts@gmail.com) Received: from py-out-1112.google.com (py-out-1112.google.com [64.233.166.181]) by mx1.freebsd.org (Postfix) with ESMTP id D36F413C484 for ; Wed, 16 May 2007 17:07:28 +0000 (UTC) (envelope-from lydianconcepts@gmail.com) Received: by py-out-1112.google.com with SMTP id f31so550238pyh for ; Wed, 16 May 2007 10:07:28 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=cftdBQP/MPVZA6rdSVVXLlU4oJ0F0kyjpxvVMlxe9gVvCM28BGL1TbruhPs8WsXt8Qd70oFkOJcwFOwwDBFIBXmAS4Ec0jxrRpHKSrbCQAIFKEibhHiNoWqsrl7RDlcim1untU4R/FX7PGlD3/6gJxyManUzqzB1rFIgVgXVnK4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=m1Eg/RU8eFY6ic0NthsFikpf/5QXBd53aYYO7+8z2ifbcvUvPgd1M6cPa+FoU7zkl+byQk/XExd6LlibCwid8CdKPHO+ldE68WSjS5M/IqJd5WlMZkMINDut0PRzGZjiAmOZ6GnRnvopt13iqvicJZc0yTSi+/TP207b39pD5HM= Received: by 10.114.168.1 with SMTP id q1mr2337093wae.1179335247914; Wed, 16 May 2007 10:07:27 -0700 (PDT) Received: by 10.114.24.2 with HTTP; Wed, 16 May 2007 10:07:27 -0700 (PDT) Message-ID: <7579f7fb0705161007i75468c80l2baf2ea462ecafc5@mail.gmail.com> Date: Wed, 16 May 2007 10:07:27 -0700 From: "Matthew Jacob" To: "Randy Schultz" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <464474F0.3040306@tomjudge.com> <7579f7fb0705110735h1a65ef7atcab00bdbc25224d6@mail.gmail.com> <7579f7fb0705151736hf1118cck71898d572f817475@mail.gmail.com> X-Mailman-Approved-At: Wed, 16 May 2007 17:12:13 +0000 Cc: freebsd-performance@freebsd.org Subject: Re: Dell SAS 5i/mpt driver[was: possible issues with Dell/Perc5 raid] X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 May 2007 17:07:29 -0000 It wouldn't surprise me in the slightest that ext3 is better albeit bursty for writes. That's the Linux aggressive write-behind and ext2/ext3 for you in a nutshell. It's also quite likely true that in many cases that reads and I/O scheduling is a lot better in Linux. If you have time to run some benchmarks, using something like dt on a FreeBSD raw partition with lots of small sequential writes and using the (now deprecated) 'raw' bound devices in fc5 might get more of an apple-apple. On 5/16/07, Randy Schultz wrote: > On Tue, 15 May 2007, Matthew Jacob spaketh thusly: > > -}filesystem? ext3? > > Correct. > > -} > -}I want one of these failing machines *in my lab*. > -} > -}On 5/14/07, Randy Schultz wrote: > -}> On Fri, 11 May 2007, Matthew Jacob spaketh thusly: > -}> > -}> -}Time frame to resolution involves getting a machine into my lab that > -}> -}evidences the poor performance and the time to sort out what the > -}> -}problem is and fix it. Remote access doesn't work for me on this one > -}> -}(contact me offline as to why). > -}> > -}> Hey Matthew, > -}> > -}> FWIW, I installed fedora core 5 on the box. The difference was significant. > -}> Writes, though bursty, increased significantly. Reads increased by 1-2 > -}> orders > -}> of magnitude. I've attached the output of blogbench for fc5 FWIW. > -}> > -}> Being new to all this, what would be the next step? Should I file a bug > -}> report? Or perhaps I should be asking what your timeline is? All I have to > -}> offer for help is remote access, which in this case doesn't work for you, or > -}> perhaps testing as my C skills are fairly pathetic. ;> > > -- > Randy (schulra@earlham.edu) 765.983.1283 <*> > > Rain puts a hole in stone because of its constancy, not its force. > - H. Joseph Gerber > >