Windows 10: AHCI still not fixed???

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  1. Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       10 Jun 2015 #31

    Want to try a nvme driver?
    OpenFabrics: Windows NVM Express Files
      My ComputerSystem Spec


  2. Posts : 265
    Windows 10 preview ########
    Thread Starter
       11 Jun 2015 #32

    not sure if this would help me, as i have the ahci version of the drive. i'll have to do some more research. but thanks for the link.
      My ComputerSystem Spec


  3. Posts : 2
    Windows 10 Build 10130
       11 Jun 2015 #33

    STEVAE said: View Post
    not sure if this would help me, as i have the ahci version of the drive. i'll have to do some more research. but thanks for the link.
    Hi all, first post here it’s an amazing Forum with great participants and a very informative one.

    You can try the latest IRST 13.6.0.1002 driver, or an old one, the IRST 13.2.4.1000, used by Anandtech’s review of this drive: http://www.anandtech.com/show/8979/s...12-gb-review/2

    Both drivers (available in Intel Download Center) should give SM 951 much better performance than native Microsoft drivers, as it’s usual with almost all AHCI drives, after all the AHCI technical standard was developed by Intel.

    Just my two cents...
    Cheers
      My ComputerSystem Spec

  4.    11 Jun 2015 #34

    Mystere said: View Post
    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
    SATA (AHCI) will not be a dead end for quite a while. SATA disks will continue to be more cost effective than flash or phase change storage, which is what NVMe is for. You cant plug a SATA or SAS hard disk drive into NVMe. Saying AHCI is dead because of NVMe is better is silly as they are apples to oranges.

    Now SAS may replace SATA, but SAS drives are generally more expensive than SATA. SATA drives are compatible with SAS, but that requires the SATA protocol gets tunneled through SAS (STP), and the drive still appears as SATA/AHCI to the OS.
      My ComputerSystem Spec


  5. Posts : 265
    Windows 10 preview ########
    Thread Starter
       11 Jun 2015 #35

    squawker said: View Post
    Hi all, first post here it’s an amazing Forum with great participants and a very informative one.

    You can try the latest IRST 13.6.0.1002 driver, or an old one, the IRST 13.2.4.1000, used by Anandtech’s review of this drive: http://www.anandtech.com/show/8979/s...12-gb-review/2

    Both drivers (available in Intel Download Center) should give SM 951 much better performance than native Microsoft drivers, as it’s usual with almost all AHCI drives, after all the AHCI technical standard was developed by Intel.

    Just my two cents...
    Cheers
    yeah, i'm already running 13.6.0.1002. it's a good comment though, as you're right, intel is responsible for ahci. thanks!
      My ComputerSystem Spec

  6.    11 Jun 2015 #36

    Geneo said: View Post
    SATA (AHCI) will not be a dead end for quite a while.
    I was quite clear about it being a dead end for PCIe devices (as in, devices you plug directly into PCI express sockets), not SATA.
      My ComputerSystem Spec

  7.    10 Aug 2015 #37

    I can confirm that this problem exists in Windows 10. I have an Asus X99 Deluxe mobo with the SM951 AHCI. Under Windows 7 i was able to get 2200MB/s read. Now i am not able to get over 1550MB/s. I have tried the ssd in the M2 slot and on the hyper-card. Makes no difference. Installed IRST_V14_5_0_1081_WHQL. Makes also no difference.
      My ComputerSystem Spec


 
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