Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion

From: Petri Helenius (pete_at_he.iki.fi)
Date: 01/24/05

  • Next message: Edward B. Dreger: "Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion" 
    Date: Tue, 25 Jan 2005 00:08:52 +0200
To: Nick Pavlica <linicks@gmail.com>

    Are you sure you aren't comparing filesystems with different mount
    options? Async comes to mind first.

    Pete

    Nick Pavlica wrote:

    >All,
    > I would like to start addressing some of the feedback that I have
    >been given. I started this discussion because I felt that it was
    >important to share the information I discovered in my testing. I also
    >want to reiterate my earlier statement that this is not an X vs. X
    >discussion, but an attempt to better understand the results, and
    >hopefully look at ways of improving the results I had with FreeBSD
    >5.x. I'm also looking forward to seeing the improvements to the 5.x
    >branch as it matures. I want to make it very clear that this is NOT A
    >"Religious/Engineering War", please don't try to turn it into one.
    >
    >That said, lets move on to something more productive. I installed
    >both operating systems using as many default options as possible and
    >updated them with all of the latest patches. I was logged in via SSH
    >from my workstation while running the tests. I didn't have X, running
    >on any of the installations because it wasn't need. CPU and RAM
    >utilization wasn't an issue during any of the tests, but the disk I/O
    >performance was dramatically different. Please keep in mind that I
    >ran these tests over and over to see if I had consistent results. I
    >even did the same tests on other pieces of equipment not listed in my
    >notes that yielded the same results time and time again. Some have
    >confirmed that they have had similar results in there testing using
    >other testing tools and methods. This makes me wounder why the gap is
    >so large, and how it can be improved?
    >
    >I think that it would be beneficial to have others in this group do
    >similar testing and post there results. This may help those that are
    >working on the OS itself to find trouble areas, and ways to improve
    >them. It may also help clarify many of the response questions because
    >you will be able to completely control the testing environment. I
    >look forward to seeing the testing results, and any good feedback that
    >helps identify specific tuning options, or bugs that need to be
    >addressed.
    >
    >Thanks!
    >--Nick Pavlica
    >--Laramie, WY
    >_______________________________________________
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    >http://lists.freebsd.org/mailman/listinfo/freebsd-performance
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    >
    >

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