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Thread: Linux I/O Scheduler Comparison On The Linux 3.4 Desktop

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  1. #1
    Join Date
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    Default Linux I/O Scheduler Comparison On The Linux 3.4 Desktop

    Phoronix: Linux I/O Scheduler Comparison On The Linux 3.4 Desktop

    At the request of Phoronix readers, and that the default I/O scheduler may change, here's a comparison of the CFQ, Deadline, and Noop schedulers on three systems and covering both rotating media (HDD) and solid-state storage (SSDs).

    http://www.phoronix.com/vr.php?view=17334

  2. #2
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    Default

    What about BFQ? zen-stable maintains a branch that's just BFQ on top of mainline, in case you want to try that: http://git.zen-kernel.org/zen-stable/log/?h=3.3/bfq

  3. #3
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    Default

    Been using Deadline with my 60MB SSD with Arch. I may switch back to CFQ based upon this article. Thanks Michael, for yet another informative article.

  4. #4
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    Jun 2011
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    Default

    Nice !
    What about BFQ ?

  5. #5
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    Can you say anything about the responsiveness during the benchmarks? I do not care, if my SSD needs 1 or 2 seconds to save/read something but it bothers me if other devices, especially input, suffer through the process...

  6. #6
    Join Date
    Feb 2009
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    Default What about responsiveness?

    For years I've had problems using the desktop while a intensive IO operation is running. Even when simply transferring file to pendrive.

    https://bugzilla.kernel.org/show_bug.cgi?id=12309

  7. #7
    Join Date
    Aug 2009
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    Albuquerque NM USA
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    Default Hard to benchmark well

    This is the kind of thing where looking at throughput numbers can easily deceive someone. If you're running a multimedia system (e.g. mythtv) then throughput it the least of your concerns, and the stuff you actually care about, isn't on these graphs at all. Not saying Michael has done badly here (what else could he have done?) but it might have been a waste of time.

  8. #8
    Join Date
    Jun 2011
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    78

    Default Re: Responsiveness

    Quote Originally Posted by talvik View Post
    For years I've had problems using the desktop while a intensive IO operation is running. Even when simply transferring file to pendrive.

    https://bugzilla.kernel.org/show_bug.cgi?id=12309
    Some other site covered the issue.
    I don't think we will see anything like it on Phoronix, but framejitter and uneven load is fairly important issues.

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