How to: Reduce latencies on Samsung laptops

Discussion in 'Samsung' started by Dannemand, Sep 12, 2012.

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  1. Forssberg

    Forssberg Notebook Enthusiast

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    Hello,

    I do not know this is good place for this thread if not I please moderator to move it to correct place of the forum :)

    I have this laptop: NP300VPA-S04.

    I have more and more issues with laptop, especially so called responsiveness, lags, freezes ect. Example I open Notepad but wait few seconds after I click File>New.
    Opening Calculator takes ages when we consider it is just simple app.
    Web browser freeze from time to time ("no response").

    I am tired of this and I try to nail exact cause of this behavior.

    1. I have read this thread - Settings/Easy Settings - what you need to know and Reduce latencies on Samsung laptops.
    2. I have installed system with minimalistic drivers. No Intel's ProSet, no Samsung's bloatware. Minimal things plus Settings (downloaded externally special version IIRC).
    3. I have done this almost half year ago.
    4. I have installed Samsung's Recovery Suite.
    5. I have Windows 7 x64 full updates.​

    Here some logs from event watcher which I consider interesting - as I use Klingon language for you I must translate so it is not exact error name:

    Code 11 Atapi
    Driver detected an controler error on \Device\Ide\IdePort0

    For four cores, Code 37, Kernel-processor-power
    Processor 0 in group 0 speed is limited by system's software. The processor had limited performance for 83602 seconds since last report.

    I have also run LatencyMon, here is the result:

    _________________________________________________________________________________________________________
    CONCLUSION
    _________________________________________________________________________________________________________
    Your system appears to be having trouble handling real-time audio and other tasks. You are likely to experience buffer underruns appearing as drop outs, clicks or pops. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
    LatencyMon has been analyzing your system for 0:04:48 (h:mm:ss) on all processors.


    _________________________________________________________________________________________________________
    SYSTEM INFORMATION
    _________________________________________________________________________________________________________
    Computer name: FORSBERG-LAPTOP
    OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x64)
    Hardware: 300V3A/300V4A/300V5A/200A4B/200A5B, SAMSUNG ELECTRONICS CO., LTD.
    CPU: GenuineIntel Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz
    Logical processors: 4
    Processor groups: 1
    RAM: 8105 MB total


    _________________________________________________________________________________________________________
    CPU SPEED
    _________________________________________________________________________________________________________
    Reported CPU speed: 2294 MHz

    Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.


    _________________________________________________________________________________________________________
    MEASURED INTERRUPT TO USER PROCESS LATENCIES
    _________________________________________________________________________________________________________
    The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

    Highest measured interrupt to process latency (µs): 25497,377573
    Average measured interrupt to process latency (µs): 8,150109

    Highest measured interrupt to DPC latency (µs): 1808,077806
    Average measured interrupt to DPC latency (µs): 1,281522


    _________________________________________________________________________________________________________
    REPORTED ISRs
    _________________________________________________________________________________________________________
    Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

    Highest ISR routine execution time (µs): 149,476024
    Driver with highest ISR routine execution time: ataport.SYS - ATAPI Driver Extension, Microsoft Corporation

    Highest reported total ISR routine time (%): 0,066408
    Driver with highest ISR total time: hal.dll - Hardware Abstraction Layer DLL, Microsoft Corporation

    Total time spent in ISRs (%) 0,150457

    ISR count (execution time <250 µs): 355689
    ISR count (execution time 250-500 µs): 0
    ISR count (execution time 500-999 µs): 0
    ISR count (execution time 1000-1999 µs): 0
    ISR count (execution time 2000-3999 µs): 0
    ISR count (execution time >=4000 µs): 0


    _________________________________________________________________________________________________________
    REPORTED DPCs
    _________________________________________________________________________________________________________
    DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

    Highest DPC routine execution time (µs): 2947,469050
    Driver with highest DPC routine execution time: ndis.sys - Sterownik NDIS 6.20, Microsoft Corporation

    Highest reported total DPC routine time (%): 0,035087
    Driver with highest DPC total execution time: i8042prt.sys - Sterownik portu i8042, Microsoft Corporation

    Total time spent in DPCs (%) 0,180039

    DPC count (execution time <250 µs): 575044
    DPC count (execution time 250-500 µs): 0
    DPC count (execution time 500-999 µs): 131
    DPC count (execution time 1000-1999 µs): 7
    DPC count (execution time 2000-3999 µs): 1
    DPC count (execution time >=4000 µs): 0


    _________________________________________________________________________________________________________
    REPORTED HARD PAGEFAULTS
    _________________________________________________________________________________________________________
    Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

    NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

    Process with highest pagefault count: svchost.exe

    Total number of hard pagefaults 105
    Hard pagefault count of hardest hit process: 46
    Highest hard pagefault resolution time (µs): 32972451,342197
    Total time spent in hard pagefaults (%): 5,36670
    Number of processes hit: 10


    _________________________________________________________________________________________________________
    PER CPU DATA
    _________________________________________________________________________________________________________
    CPU 0 Interrupt cycle time (s): 6,151021
    CPU 0 ISR highest execution time (µs): 149,476024
    CPU 0 ISR total execution time (s): 1,734172
    CPU 0 ISR count: 355689
    CPU 0 DPC highest execution time (µs): 2947,469050
    CPU 0 DPC total execution time (s): 1,939240
    CPU 0 DPC count: 552284
    _________________________________________________________________________________________________________
    CPU 1 Interrupt cycle time (s): 1,390539
    CPU 1 ISR highest execution time (µs): 0,0
    CPU 1 ISR total execution time (s): 0,0
    CPU 1 ISR count: 0
    CPU 1 DPC highest execution time (µs): 245,069311
    CPU 1 DPC total execution time (s): 0,020001
    CPU 1 DPC count: 4524
    _________________________________________________________________________________________________________
    CPU 2 Interrupt cycle time (s): 1,741382
    CPU 2 ISR highest execution time (µs): 0,0
    CPU 2 ISR total execution time (s): 0,0
    CPU 2 ISR count: 0
    CPU 2 DPC highest execution time (µs): 344,082825
    CPU 2 DPC total execution time (s): 0,068978
    CPU 2 DPC count: 9870
    _________________________________________________________________________________________________________
    CPU 3 Interrupt cycle time (s): 2,055771
    CPU 3 ISR highest execution time (µs): 0,0
    CPU 3 ISR total execution time (s): 0,0
    CPU 3 ISR count: 0
    CPU 3 DPC highest execution time (µs): 396,544464
    CPU 3 DPC total execution time (s): 0,046912
    CPU 3 DPC count: 8505
    _________________________________________________________________________________________________________

    What could I do more to get laptop working normal?
    I would rather avoid remove Settings because there is no other app which can control volume and brightness of screen via keys.
    After I restart system it is OK till next hibernation & wake up few times, usually 3 days.

    Today I know I will never buy Samsung laptop again. But it would be waste of money throwing this thing to trash so I beg for some kind solution to make this laptop working normally.
     
  2. John Ratsey

    John Ratsey Moderately inquisitive Super Moderator

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    I've merged your post into the main discussion about latency issues so your comments add to the knowledge in that thread.

    If you are lucky, someone else who has battled with the latency issues will respond and comment.

    John
     
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