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  1. Joined : Jun 2015
    beqa lagoon, fiji
    Posts : 265
    Windows 10 preview ########
       07 Jun 2015 #1

    AHCI still not fixed???


    has anyone found any information about ms fixing ahci in win 10? i just can't believe after so many months that they STILL have not fixed this. any new information is appreciated. thanks!
      My System SpecsSystem Spec


  2. Joined : Oct 2013
    Texas
    Posts : 7,537
    Windows 10 Pro X64
       07 Jun 2015 #2

    Can you explain further? I have my BIOS set AHCI and it works fine for me.
      My System SpecsSystem Spec


  3. Joined : Nov 2013
    Toronto
    Posts : 4,288
    Win 10 Pro x64
       07 Jun 2015 #3

    STEVAE said: View Post
    has anyone found any information about ms fixing ahci in win 10? i just can't believe after so many months that they STILL have not fixed this. any new information is appreciated. thanks!
    Isn't that part of the chipset driver?
      My System SpecsSystem Spec


  4. Joined : Oct 2013
    Texas
    Posts : 7,537
    Windows 10 Pro X64
       07 Jun 2015 #4

    badrobot said: View Post
    Isn't that part of the chipset driver?
    Yes it is, as well as a setting in the BIOS
      My System SpecsSystem Spec


  5. Joined : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       07 Jun 2015 #5

    Stevae,

    I don't to understand what you mean by fixing ahci.

    The only thing I can think of is that some OEMs simply set the BIOS to default AHCI and don't list the option. HP is one of those OEMs, but I though ASUS provided more access to BIOS options.

    If it isn't the BIOS setting that you're question concerns, please provide a better description of the issue.
      My System SpecsSystem Spec


  6. Joined : Jul 2014
    Serbia
    Posts : 6,972
    All kinds
       08 Jun 2015 #6

    Msahci was badly flowed in some early AMD chipsets and was giving poor results with SSDs. I have run into those problems couple of years ago. There were some modded AMD AHCI drivers that did the job better starting from Win7. Solutions were to install AMD 14.2 Omega drivers that contained chipset drivers too. Since than, SSDs work just fine in AHCI mode although a bit slower than on Intel chipsets with IRST drivers. Difference is all but impossible to see in normal operation.
    Edit
    Win10 has apparently fixed problems with IDE/AHCI modes as it boots up in either mode without having to change Registry unlike Win7 when you have to do it manually. In W8.1 if you are in wrong SATA mode is enough to BOOT in safe mode, reboot in regular mode for changes to take effect.
      My System SpecsSystem Spec


  7. Joined : Jun 2015
    beqa lagoon, fiji
    Posts : 265
    Windows 10 preview ########
       08 Jun 2015 #7

    Slartybart said: View Post
    Stevae,

    I don't to understand what you mean by fixing ahci.

    The only thing I can think of is that some OEMs simply set the BIOS to default AHCI and don't list the option. HP is one of those OEMs, but I though ASUS provided more access to BIOS options.

    If it isn't the BIOS setting that you're question concerns, please provide a better description of the issue.
    what i mean is for advanced drives. i have the pcie sm951 ahci ssd. this is one of the newest and fastest drives in the world right now, and windows ten version of ahci is not optimized to be able to use it to its fullest potential, because they haven't updated the drivers for ahci. of course there are no problems with older ahci drives, but for anything new, they just haven't bothered to get around to it. and that is strange considering that win 10 is not only the newest version of windows, but supposed to be optimized for just these type of situations.
      My System SpecsSystem Spec


  8. Joined : Sep 2014
    Posts : 2,923
    Windows 10 Pro
       08 Jun 2015 #8

    STEVAE said: View Post
    what i mean is for advanced drives. i have the pcie sm951 ahci ssd. this is one of the newest and fastest drives in the world right now, and windows ten version of ahci is not optimized to be able to use it to its fullest potential, because they haven't updated the drivers for ahci. of course there are no problems with older ahci drives, but for anything new, they just haven't bothered to get around to it. and that is strange considering that win 10 is not only the newest version of windows, but supposed to be optimized for just these type of situations.
    I think its highly unlikely that the generic ahci driver would cover a specialized drive. Your drive manufacturer likely will have to provide a driver for it.
      My System SpecsSystem Spec


  9. Joined : Jun 2015
    beqa lagoon, fiji
    Posts : 265
    Windows 10 preview ########
       08 Jun 2015 #9

    its not a generic driver, and it isn't for the specific drive. it is for the newer technology. read up on the sm951 and you will see. it is all covered in several of the reviews.
      My System SpecsSystem Spec


  10. Joined : Sep 2014
    Posts : 2,923
    Windows 10 Pro
       08 Jun 2015 #10

    STEVAE said: View Post
    its not a generic driver, and it isn't for the specific drive. it is for the newer technology. read up on the sm951 and you will see. it is all covered in several of the reviews.
    What i'm reading is that AHCI is basically a dead-end for PCIe devices, and that a new controller type called NVMe (or NVMHCI) is what will be used to make these drives perform well. However, you need to have a drive designed for NVMe.

    I'm not really finding any information on improve AHCI drivers... The problem stems from the limitations of the AHCI protocol itself, which you can read about here:

    NVM Express - Wikipedia, the free encyclopedia

    Specifically this:

    AHCI NVMe
    Maximum queue depth 1 command queue;
    32 commands per queue
    65536 queues;
    65536 commands per queue
    Uncacheable register accesses
    (2000 cycles each)
    6 per non-queued command;
    9 per queued command
    2 per command
    MSI-X
    and interrupt steering
    single interrupt;
    no steering
    2048 MSI-X interrupts
    Parallelism
    and multiple threads
    requires synchronization lock
    to issue a command
    no locking
    Efficiency
    for 4 KB commands
    command parameters require
    two serialized host DRAM fetches
    gets command parameters
    in one 64 Bytes fetch
      My System SpecsSystem Spec


 
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