1. #1

    Latency problem after xperf and new nvidia driver

    Much thanks in advance.

    I am running Windows 7 (64) and am having a huge latency issue 100% of the time). I ran an xperf and the results showed a large spike on nvlddmkm.sys (Actual Duration 688):

    Latency problem after xperf and new nvidia driver-xperf_results_table-jpg

    I downloaded and installed the new driver from Nvidia, and restarted my computer, but the latency problem is still there 100% of the time. Any ideas?


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  2. #2

    Re: Latency problem after xperf and new nvidia driver

    I wanted to add a few more screenshots from DPC Latency Checker and LatencyMon:

    Latency problem after xperf and new nvidia driver-dpc_latency_checker-jpg

    Latency problem after xperf and new nvidia driver-latency_mon_jpg-jpg

    I also performed a Windows Memory Test, which found no problems. In addition I made sure Windows Update had everything up to date.

    Any ideas?

  3. #3

    Re: Latency problem after xperf and new nvidia driver

    I thought I'd add my system info:

    OS Name Microsoft Windows 7 Home Premium
    Version 6.1.7601 Service Pack 1 Build 7601
    Other OS Description Not Available
    OS Manufacturer Microsoft Corporation
    System Name LATKA-VAIO
    System Manufacturer Sony Corporation
    System Model VPCF226FM
    System Type x64-based PC
    Processor Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz, 2001 Mhz, 4 Core(s), 8 Logical Processor(s)
    BIOS Version/Date American Megatrends Inc. R1170V3, 4/20/2011
    SMBIOS Version 2.7
    Windows Directory C:\Windows
    System Directory C:\Windows\system32
    Boot Device \Device\HarddiskVolume2
    Hardware Abstraction Layer Version = "6.1.7601.17514"
    Installed Physical Memory (RAM) 8.00 GB
    Total Physical Memory 7.98 GB
    Available Physical Memory 5.35 GB
    Total Virtual Memory 16.0 GB
    Available Virtual Memory 12.6 GB
    Page File Space 7.98 GB
    Page File C:\pagefile.sys

    Also, the DPC Latency Checker is all over the place. It can go for several minutes spiked above 16000ms, but I've also had a stretch or two of 1-2 minutes with everything under 1000ms. Here is another screenshot:

    Latency problem after xperf and new nvidia driver-dpc_latency_checker2-jpg

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