1. #1

    [W10ProV1703b15063 x64] DPC storport

    I am new to this forum. I made an account here because of an issue I have been having with DPC latency. I have spent hours trying to figure out how to fix it, but I have failed to find a solution.

    To begin, I first noticed this issue after I cloned my Samsung SSD to my new Samsung 960 evo m.2 drive. After playing some games like battlegrounds, dark souls, and final fantasy, I noticed that each one of them would microstutter every 30 minutes or so with a buzzing noise. They last for only about a second and then the game continues like nothing happened. I did some research and found out about DPC latency so I downloaded LatencyMon and dpclat. I then played a game with both of them running in the background until one of these audio/video stutters occurred. As soon as it happened, I alt+tabbed to my desktop and brought the two programs into view. dpclat showed all green bars and then one massive red one followed by all small green bars again. LatencyMon just simply showed storport.sys as having the highest reported DPC routine execution time.
    I am completely baffled. I uninstalled and updated all of my drivers (bios, audio, internet/lan from the ASUS website), uninstalled the 960 evo NVMe drivers to see if windows NVM drivers fixed the issue (they didnt), installed the latest samsung 2.2 nvme drivers again, disabled all of my overclocks, ran memtest and chkdsk, ran HD tune, used defraggler to optimize my m.2 and ssd, defragged my HDDs, updated my chipset, updated my gpu, disabled almost everything in device manager, turned off every service that wasnt made by windows, stopped every process that wasnt made by windows, ran sfc /scannow and successfully repaired corrupt files, installed (and then uninstalled after use) malwarebytes, adwcleaner, msert, and avira, used ccleaner to clean and repair registry, and others that I cannot think of at the moment. The issue still persists after all of this. It seems like the only resort would be to do a complete clean install of windows, but I have tweaked with too many settings to optimize this pc and it would take days to get everything back to where I had it. I am hoping someone can help me, as this problem started after I cloned my 940 pro to my 960evo (the 940 pro was previously my C drive with windows installed, but now it is the 960 evo m.2 running the OS).
    Also, I dont know if it helps, but after cloning my SSD to my m.2 windows said it needed to be activated, so I activated it with KMS since my previous windows 7 key wouldnt work for some reason (I used my windows 7 key to get a free copy of windows 8, and then windows 8 automatically updated to windows 10). And I feel like this should be obvious, but running the samsung magician benchmarking tool for my m.2 shows a very high DPC latency spike for storport.sys, as does running HD tune, but I think this is just because of the heavy load the m.2 is under when using those tools. As of now, I turned my ram and CPU overclocks back to where I had them previously before I cloned my ssd to my m.2 since they shouldnt be the issue since I never had this program until I cloned my drive (I used samsung's migration tool to accomplish this).
    Thanks in advance to whoever offers some advice!

    Here is a quick summary of my specs (full speccy txt file and DPC checker results attached separately):

    Operating System
    Windows 10 Pro 64-bit
    AMD Ryzen 7 1700X 54 C
    Summit Ridge 14nm Technology
    16.0GB Dual-Channel Unknown @ 1529MHz (16-18-18-36)
    BenQ XL2730Z (2560x1440@144Hz)
    8176MB ATI Radeon RX Vega (ATI) 33 C
    238GB Samsung SSD 840 PRO Series (SSD) 29 C
    931GB Seagate ST1000DX002-2DV162 (SATA) 31 C
    931GB Seagate ST1000DM003-9YN162 (SATA) 29 C
    232GB Samsung SSD 960 EVO 250GB (Unknown)
    1862GB Western Digital WD Elements 25A1 USB Device (SSD) 29 C
    Optical Drives
    ATAPI iHBS112 2
    ATAPI iHAS324 B
    Realtek High Definition Audio
    Operating System
    Windows 10 Pro 64-bit
    Computer type: Desktop

    Specs.txt ... DPC Results.txt ... DPC Results 2.txt ... [W10ProV1703b15063 x64] DPC storport-capture-png

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  2. #2

    Re: DPC Latency most likely caused by storport.sys

    I dont know how to change the title, but I think It should be:[W10ProV1703b15063 x64] storport.sys DPC latency

  3. #3

    Re: DPC Latency most likely caused by storport.sys

    Also, my PSU is the EVGA Supernova 850 P2 (80 Plus Platinum), and my ram is in dual channel slots 1 and 3. I will try and upload a link to my trace file soon.

  4. #4

    Re: DPC Latency most likely caused by storport.sys

    Here are some more screenshots and the trace files:

    Screenshot 1: Capture1.PNG - Google Drive
    Screenshot 2: Capture1_2.PNG - Google Drive
    Screenshot 3: Capture2.PNG - Google Drive

    Trace File 1 (biggest spike recorded with this one): trace 1 (biggest spike).etl - Google Drive
    Trace File 2: trace2.etl - Google Drive
    Trace File 3: https://drive.google.com/open?id=0B8...1ZQVXR4T2hNZkE

  5. #5
    Sysnative Staff
    BSOD Kernel Dump Analyst
    axe0's Avatar
    Join Date
    May 2015
    The Netherlands
    • specs System Specs
      • Manufacturer:
        Custom build
      • Motherboard:
        Gigabyte B150-HD3P-CF
      • CPU:
        Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
      • Memory:
        16GB DDR4 Crucial Ballistix Sport LT BLS8G4D240F
      • Graphics:
        Intel(R) HD Graphics 530
      • Sound Card:
        (1) Intel(R) Display Audio (2) Realtek HD Audio
      • Hard Drives:
        Crucial MX200 500GB & 2x Toshiba DT01ACA300
      • Power Supply:
        Corsair RM550x
      • Case:
        Fractal Design Define S
      • Cooling:
        Cooler Master TX3 i
      • Display:
        24" Liyama ProLite XB2483HSU-B2 & 24" Dell Ultrasharp U2414H
      • Operating System:
        Windows 10 Pro

    Re: DPC Latency most likely caused by storport.sys

    after cloning my SSD to my m.2 windows said it needed to be activated, so I activated it with KMS since my previous windows 7 key wouldnt work for some reason
    I assume you've used a KMS activator that's on the internet which makes your Windows a counterfeit.
    This is a problem, we do not offer support whilst piracy is present as it is against the forum rules.

    I hope you have a backup that you can use on your Samsung SSD to restore Windows before you used KMS, if not I, unfortunately, have to ask you to reinstall Windows. The Windows Update Experts may be able to help you with your activation issue, but please do not use anything to ilegally activate software.

  6. #6

    Re: DPC Latency most likely caused by storport.sys

    I was able to reactivate windows 10 pro without the KMS activator now. Sadly, I had to purchase a new key off of amazon to get the pro version.

  7. #7
    xilolee's Avatar
    Join Date
    Dec 2013
    World, Europe, Italy
    • specs System Specs
      • Manufacturer:
      • Model Number:
      • Motherboard:
        ASROCK FM2A88M Pro3+ chipset A88X Bolton-D4
      • CPU:
        A10-7800, 4 CPU, 4 thr, 65/45W, FM2+, 28nm, Steamroller/Kaveri
      • Memory:
        10GB (Nanya and kingston ddr3-1333 9-9-9-24)
      • Graphics:
        Radeon R7 720MHz (8 GPU cores, integrated in CPU)
      • Sound Card:
        RealTek ALC662 (integrated in MB)
      • Hard Drives:
        Seagate ST500DM002-1BD142 500GB 7200RPM
      • Power Supply:
        SuperFlower 450W 80+ Platinum (SF-450P14PE)
      • Case:
        Sharkoon VG4-S
      • Cooling:
        Realtek RTL8111GR (NIC integrated in MB)
      • Display:
        Samsung SyncMaster SA100 LS22A100NS-EN
      • Operating System:
        Windows 10 Home/Standard x64

    Re: [W10ProV1703b15063 x64] DPC storport

    Hi wafflesthewaffle.

    Move your Radeon RX Vega from PCIEX16_2 to PCIEX16_1, remove all HDDs (except the one with the system), and see what happens.

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