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Thread: MBA rev.A 128 GB sequential 4k read performance degradation!




  1. #1
    Join Date
    Jan 2010
    Location
    moscow
    Posts
    8

    Exclamation MBA rev.A 128 GB 4k read performance degradation!

    Here we are.. I just realized that general performance and expecially READ performance of my SSD are far degraded!

    Xbench disk score, after fresh install on new SSD, were around 110 with the following typical values (these are not originally mine but mine were similar):

    Disk Test 110.69
    Sequential 78.36
    Uncached Write 84.79 52.06 MB/sec [4K blocks]
    Uncached Write 78.03 44.15 MB/sec [256K blocks]
    Uncached Read 51.01 14.93 MB/sec [4K blocks]
    Uncached Read 146.25 73.50 MB/sec [256K blocks]
    Random 188.45
    Uncached Write 78.43 8.30 MB/sec [4K blocks]
    Uncached Write 182.09 58.29 MB/sec [256K blocks]
    Uncached Read 1871.94 13.27 MB/sec [4K blocks]
    Uncached Read 408.13 75.73 MB/sec [256K blocks]

    Hereafter the result today:

    Disk Test 62.73 (this is actually my last test)
    Sequential 46.88
    Uncached Write 68.56 42.09 MB/sec [4K blocks] (acceptable)
    Uncached Write 56.54 31.99 MB/sec [256K blocks] (acceptable)
    Uncached Read 21.61 6.32 MB/sec [4K blocks] (fair slow!!)
    Uncached Read 147.63 74.20 MB/sec [256K blocks] (perfect!)
    Random 94.75
    Uncached Write 49.83 5.28 MB/sec [4K blocks]
    Uncached Write 115.17 36.87 MB/sec [256K blocks]
    Uncached Read 103.45 0.73 MB/sec [4K blocks] (this is 18 times slower!!)
    Uncached Read 263.02 48.80 MB/sec [256K blocks] (fair slow!)

    Now, I did know about the WRITING slowdown, the need of a TRIM function and so on.. but I have no explanation (and I can't figure any solution) for the READ slowdown.

    I tried to use ShredIt X shredding all free space with "ones" several times but performance didn't recover.

    Than I cloned SSD on an external usb drive, I've made a full de-fragmentation of this disk and then I restarted the air from the new usb, I then reinitialized a couple of time the internal SSD and re-cloned from the usb to the SSD...

    Nothing!

    The only change I got it is about boot time (from 40 sec to 2' and 30") because of some service hanging on startup (I still have to check verbose startup)... but performance are still there with READ speeds very low (especially RANDOM) and the super-fast feeling gone!

    What to do to restore ALL performance to, at least, a good 80% of a brand new disk??? Is it possible to reset the disk controller?? Without removing the disk from the Air (may be booting from another external usb disk)??
    Last edited by marianic; 01-20-2010 at 03:44 PM.

  2. #2
    Join Date
    Oct 2009
    Location
    CN
    Posts
    172

    Default Re: MBA rev.A 128 GB sequential 4k read performance degradation!

    What is your firmware now?
    I can send you a wiper.exe to resume the perfomance.

  3. #3
    Join Date
    Jan 2010
    Location
    moscow
    Posts
    8

    Default Re: MBA rev.A 128 GB sequential 4k read performance degradation!

    Quote Originally Posted by RunCore Tech_Support View Post
    What is your firmware now?
    I can send you a wiper.exe to resume the perfomance.

    wiper.exe do not look like it is usable on MAC OSX.. however, how does it work?

    About the firmware, this are the informations i found on mac system profiler:

    RunCore 128G-C SSD:
    Revision 1819
    Serial number RC280912020016

  4. #4
    Join Date
    Oct 2009
    Location
    CN
    Posts
    172

    Default Re: MBA rev.A 128 GB sequential 4k read performance degradation!

    Yes. It can‘t be used on Mac OS.
    Can you give a message to support@runcore.com
    We will give you a reply.
    Last edited by RunCore Tech_Support; 01-22-2010 at 01:31 PM. Reason: sorry

  5. #5
    Join Date
    Nov 2009
    Location
    USA
    Posts
    9

    Default Re: MBA rev.A 128 GB sequential 4k read performance degradation!

    Quote Originally Posted by RunCore support@runcore.com
    Thanks for concern on it.
    The Wiper.exe support Windows only. It can't be used on Mac OS.
    It can't be used on Mac OS X and there is currently no solution to prevent this performance degradation on OS X.

  6. #6
    Join Date
    Jan 2010
    Location
    moscow
    Posts
    8

    Default Re: MBA rev.A 128 GB sequential 4k read performance degradation!

    I've got also a FW update but it seem that there's no way to use it on a MacBook since it must be run from a Dos bootdisk.

    I tried several tricks, I've even installed rEFIt which should allow multiple boots but nothing to do, I tried usb and floppy dos boot disks (win '98 and '95 startup) without luck, same disks work perfectly on an old Dell laptop.

    I'm almost sure that to allow a fw update on a Macintosh installed SSD we need a specifically developed application.

    If my disk were a standard 2.5' SATA drive I could had it connected to an old DELL laptop I still have.. but as it is, a pata zif, I don't even want to think about "how to". Even opening again the MBA and removing the SSD it's something I don't even want to think about.

    Mac world is nice but when we come to 3rd party device support it can be a pain.

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