I have an Acer Aspire One D270 that has had latency issues ever since I bought it. I have tried reinstalling Windows, disabling devices, and seeing the latency on a fresh install with only the drivers Windows found. There was still latency. Sometimes, it will go away for a bit then come back. The audio crackles/pops and is not enjoyable to listen to. This also happens on multiple songs. Any suggestions are appreciated.
Here is the information from LatencyMon.
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CONCLUSION
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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 0:01:48 (h:mm:ss) on all processors.
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SYSTEM INFORMATION
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Computer name: CALEBW-AOD270
OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x86)
Hardware: AOD270, Acer, JE01_CT
CPU: GenuineIntel Intel(R) Atom(TM) CPU N2600 @ 1.60GHz
Logical processors: 4
Processor groups: 1
RAM: 2036 MB total
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CPU SPEED
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Reported CPU speed: 1596.0 MHz
Measured CPU speed: 1247.0 MHz (approx.)
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.
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MEASURED INTERRUPT TO USER PROCESS LATENCIES
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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): 18464.554855
Average measured interrupt to process latency (µs): 31.998487
Highest measured interrupt to DPC latency (µs): 755.134853
Average measured interrupt to DPC latency (µs): 7.979202
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REPORTED ISRs
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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): 214.105263
Driver with highest ISR routine execution time: i8042prt.sys - i8042 Port Driver, Microsoft Corporation
Highest reported total ISR routine time (%): 0.044427
Driver with highest ISR total time: iaStor.sys - Intel Rapid Storage Technology driver - x86, Intel Corporation
Total time spent in ISRs (%) 0.094057
ISR count (execution time <250 µs): 14556
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
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REPORTED DPCs
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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): 18125.604010
Driver with highest DPC routine execution time: iaStor.sys - Intel Rapid Storage Technology driver - x86, Intel Corporation
Highest reported total DPC routine time (%): 0.170938
Driver with highest DPC total execution time: iaStor.sys - Intel Rapid Storage Technology driver - x86, Intel Corporation
Total time spent in DPCs (%) 0.448058
DPC count (execution time <250 µs): 73071
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 224
DPC count (execution time 1000-1999 µs): 2
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0
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REPORTED HARD PAGEFAULTS
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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.
Process with highest pagefault count: wmpnetwk.exe
Total number of hard pagefaults 1
Hard pagefault count of hardest hit process: 1
Highest hard pagefault resolution time (µs): 48.426065
Total time spent in hard pagefaults (%): 0.000011
Number of processes hit: 1
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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 1.921953
CPU 0 ISR highest execution time (µs): 147.889724
CPU 0 ISR total execution time (s): 0.106376
CPU 0 ISR count: 3721
CPU 0 DPC highest execution time (µs): 18125.604010
CPU 0 DPC total execution time (s): 0.916979
CPU 0 DPC count: 49582
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CPU 1 Interrupt cycle time (s): 0.943511
CPU 1 ISR highest execution time (µs): 140.080201
CPU 1 ISR total execution time (s): 0.103860
CPU 1 ISR count: 3607
CPU 1 DPC highest execution time (µs): 17817.473684
CPU 1 DPC total execution time (s): 0.315579
CPU 1 DPC count: 5601
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CPU 2 Interrupt cycle time (s): 1.104290
CPU 2 ISR highest execution time (µs): 139.508772
CPU 2 ISR total execution time (s): 0.100969
CPU 2 ISR count: 3735
CPU 2 DPC highest execution time (µs): 1287.538847
CPU 2 DPC total execution time (s): 0.397283
CPU 2 DPC count: 10986
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CPU 3 Interrupt cycle time (s): 0.811568
CPU 3 ISR highest execution time (µs): 214.105263
CPU 3 ISR total execution time (s): 0.098468
CPU 3 ISR count: 3493
CPU 3 DPC highest execution time (µs): 11898.315789
CPU 3 DPC total execution time (s): 0.321704
CPU 3 DPC count: 7131
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I have another report from LatencyMon. This is with the Power plan set to High Performance and the minimum performance state for the CPU set to 100% when plugged in or on battery.
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CONCLUSION
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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 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 0:04:47 (h:mm:ss) on all processors.
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SYSTEM INFORMATION
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Computer name: CALEBW-AOD270
OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x86)
Hardware: AOD270, Acer, JE01_CT
CPU: GenuineIntel Intel(R) Atom(TM) CPU N2600 @ 1.60GHz
Logical processors: 4
Processor groups: 1
RAM: 2036 MB total
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CPU SPEED
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Reported CPU speed: 1596.0 MHz
Measured CPU speed: 1996.0 MHz (approx.)
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.
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MEASURED INTERRUPT TO USER PROCESS LATENCIES
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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): 15644.828706
Average measured interrupt to process latency (µs): 21.759667
Highest measured interrupt to DPC latency (µs): 472.199874
Average measured interrupt to DPC latency (µs): 3.872687
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REPORTED ISRs
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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): 160.170426
Driver with highest ISR routine execution time: ndis.sys - NDIS 6.20 driver, Microsoft Corporation
Highest reported total ISR routine time (%): 0.049957
Driver with highest ISR total time: iaStor.sys - Intel Rapid Storage Technology driver - x86, Intel Corporation
Total time spent in ISRs (%) 0.086484
ISR count (execution time <250 µs): 34522
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
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REPORTED DPCs
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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): 573.268170
Driver with highest DPC routine execution time: ndis.sys - NDIS 6.20 driver, Microsoft Corporation
Highest reported total DPC routine time (%): 0.133075
Driver with highest DPC total execution time: iaStor.sys - Intel Rapid Storage Technology driver - x86, Intel Corporation
Total time spent in DPCs (%) 0.368347
DPC count (execution time <250 µs): 211656
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 190
DPC count (execution time 1000-1999 µs): 0
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0
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REPORTED HARD PAGEFAULTS
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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.
Process with highest pagefault count: none
Total number of hard pagefaults 0
Hard pagefault count of hardest hit process: 0
Highest hard pagefault resolution time (µs): 0.0
Total time spent in hard pagefaults (%): 0.0
Number of processes hit: 0
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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 3.579230
CPU 0 ISR highest execution time (µs): 160.170426
CPU 0 ISR total execution time (s): 0.255319
CPU 0 ISR count: 8793
CPU 0 DPC highest execution time (µs): 573.268170
CPU 0 DPC total execution time (s): 1.956132
CPU 0 DPC count: 140003
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CPU 1 Interrupt cycle time (s): 1.505585
CPU 1 ISR highest execution time (µs): 140.070175
CPU 1 ISR total execution time (s): 0.249366
CPU 1 ISR count: 8578
CPU 1 DPC highest execution time (µs): 489.418546
CPU 1 DPC total execution time (s): 0.652857
CPU 1 DPC count: 15077
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CPU 2 Interrupt cycle time (s): 2.211742
CPU 2 ISR highest execution time (µs): 113.147870
CPU 2 ISR total execution time (s): 0.244859
CPU 2 ISR count: 8613
CPU 2 DPC highest execution time (µs): 395.679198
CPU 2 DPC total execution time (s): 0.958246
CPU 2 DPC count: 41281
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CPU 3 Interrupt cycle time (s): 1.394159
CPU 3 ISR highest execution time (µs): 124.817043
CPU 3 ISR total execution time (s): 0.243754
CPU 3 ISR count: 8538
CPU 3 DPC highest execution time (µs): 450.676692
CPU 3 DPC total execution time (s): 0.663382
CPU 3 DPC count: 15485
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