Date: Wed, 16 May 2007 10:07:27 -0700 From: "Matthew Jacob" <lydianconcepts@gmail.com> To: "Randy Schultz" <schulra@earlham.edu> Cc: freebsd-performance@freebsd.org Subject: Re: Dell SAS 5i/mpt driver[was: possible issues with Dell/Perc5 raid] Message-ID: <7579f7fb0705161007i75468c80l2baf2ea462ecafc5@mail.gmail.com> In-Reply-To: <Pine.BSF.4.64.0705160814560.67208@tdream.lly.earlham.edu> References: <Pine.BSF.4.64.0705101545340.34925@tdream.lly.earlham.edu> <464474F0.3040306@tomjudge.com> <7579f7fb0705110735h1a65ef7atcab00bdbc25224d6@mail.gmail.com> <Pine.BSF.4.64.0705142329190.58912@tdream.lly.earlham.edu> <7579f7fb0705151736hf1118cck71898d572f817475@mail.gmail.com> <Pine.BSF.4.64.0705160814560.67208@tdream.lly.earlham.edu>
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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 <schulra@earlham.edu> 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 <schulra@earlham.edu> 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 > >
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