AHCI vs. IDE Modes With A SATA 3.0 SSD On Linux

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  • phoronix
    Administrator
    • Jan 2007
    • 67366

    AHCI vs. IDE Modes With A SATA 3.0 SSD On Linux

    Phoronix: AHCI vs. IDE Modes With A SATA 3.0 SSD On Linux

    Days ago benchmarks were shared from OpenBenchmarking.org that compared AHCI and IDE modes under Linux when it came to the resulting disk performance. There was a fair amount of interest generated out of that so some AHCI vs. IDE mode comparisons from a Serial ATA 3.0 SSD on an Ubuntu Linux host were benchmarked at Phoronix.

    Phoronix, Linux Hardware Reviews, Linux hardware benchmarks, Linux server benchmarks, Linux benchmarking, Desktop Linux, Linux performance, Open Source graphics, Linux How To, Ubuntu benchmarks, Ubuntu hardware, Phoronix Test Suite
  • curaga
    Senior Member
    • Feb 2008
    • 5924

    #2
    On some mobos AHCI mode slows down boot by several seconds (in the bios phase, as it fires up some code and probes drives). This happen with the test hw?

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    • e8hffff
      Senior Member
      • Jan 2011
      • 539

      #3
      Cool, I've always wondered which is the better performer. Now to check if I remembered to have AHCI after the last bios flash.

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      • DeepDayze
        Senior Member
        • Sep 2007
        • 1207

        #4
        Originally posted by curaga View Post
        On some mobos AHCI mode slows down boot by several seconds (in the bios phase, as it fires up some code and probes drives). This happen with the test hw?
        That's the tradeoff for having decent disk performance though on some systems

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        • Peterix
          Junior Member
          • Jun 2007
          • 22

          #5
          If anyone EVER considers using IDE mode with an SSD: DON'T!

          In general, linux won't even detect that your SSD supports TRIM in IDE mode. You'll end up with a very slow/useless/ready for low level format SSD, very soon.

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          • MonkeyPaw
            Phoronix Member
            • May 2012
            • 63

            #6
            What I've often wondered is if any additional tweaks are needed when running an SSD with 12.04. Seems to be a lot of conflicting information out there as to what to do to "preserve life" and "increase performance." I know Windows 7 identifies an SSD and configures it differently than an HDD, but I've always wondered what the Linux distros do.

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            • Vadi
              Phoronix Test Suite Contributor
              • Dec 2007
              • 688

              #7
              Me too - and I'd like to hear it from an expert, supported with benchmarks or proof instead of just theory. I've left mine as-is so far - it's running splendidly.

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              • WorBlux
                Senior Member
                • Jan 2011
                • 434

                #8
                Originally posted by MonkeyPaw View Post
                What I've often wondered is if any additional tweaks are needed when running an SSD with 12.04. Seems to be a lot of conflicting information out there as to what to do to "preserve life" and "increase performance." I know Windows 7 identifies an SSD and configures it differently than an HDD, but I've always wondered what the Linux distros do.
                Align the sectors, enable trim, keep additional free space to trim and wear leveling actually have the chance to work. Everything else is just sort of gravy. Moving swap into tempfs or zCache is great if you have the RAM to do it.

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                • MonkeyPaw
                  Phoronix Member
                  • May 2012
                  • 63

                  #9
                  Originally posted by WorBlux View Post
                  Align the sectors, enable trim, keep additional free space to trim and wear leveling actually have the chance to work. Everything else is just sort of gravy. Moving swap into tempfs or zCache is great if you have the RAM to do it.
                  I've actually disabled swap with seemingly no ill effects. I have 8GB of RAM and usually sit around 1.5-2.0GB usage under normal conditions.

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                  • RealNC
                    Senior Member
                    • Jul 2008
                    • 4247

                    #10
                    Most people don't have SSDs, so why not bench disks instead?

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