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  1. #1
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    Sound lag when switching windows tabs on G551JW

    Hi:

    I am having weird problem - it occurs often when I switch tabs and in the same time I am listening to some music (using winamp for that). I am using Win 7 X64 as OS. Has anyone encountered the same problem before? It sounds very much as IRQ priority issue.

    Thanks,
    Konstantin

  2. #2
    ROG Guru: Blue Belt Array Gps3dx PC Specs
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    Can you please provide more details ? can you screen-capture it as video ?
    does the music comes from a "line-in" source ?
    are you alt+tab from a game ( graphics heavy duty app ) to the desktop ? or is it a pure desktop work alt-tabing ( office and web browsing ( non 3D ))

    far fetch idea: read here

  3. #3
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    Quote Originally Posted by Gps3dx View Post
    Can you please provide more details ? can you screen-capture it as video ?
    does the music comes from a "line-in" source ?
    are you alt+tab from a game ( graphics heavy duty app ) to the desktop ? or is it a pure desktop work alt-tabing ( office and web browsing ( non 3D ))

    far fetch idea: read here
    Simple alt+tab and I was not playing any games. The audio output was from the built-in speakers. Actually it is not even related to the app itself (winapp in this case). When I login from a standby I can hear the jitter/lag noise. My default VGA card is the intel one. I will give it a shot and see if changing to 16bpp will make any difference.

  4. #4
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    Quote Originally Posted by Gps3dx View Post
    Can you please provide more details ? can you screen-capture it as video ?
    does the music comes from a "line-in" source ?
    are you alt+tab from a game ( graphics heavy duty app ) to the desktop ? or is it a pure desktop work alt-tabing ( office and web browsing ( non 3D ))

    far fetch idea: read here
    Unfortunately the far fetched idea did not work for me.

  5. #5
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    It was avast + nvidia driver. Installed old nvidia driver so I will say it is around 90% problem solved. Nvidia still has to fix the high DPC latency.

  6. #6
    ROG Guru: Blue Belt Array Gps3dx PC Specs
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    Quote Originally Posted by iozho View Post
    Nvidia still has to fix the high DPC latency.
    well.. I know that drivers & apps ( nvidia specificly ) can rise your DPC latency - which is a "bug" state of these drivers/apps.
    nontheless, the Windows itself is also part of the blam. ( i.e with win8 and above, on same HW, you won't necessary be getting this DCP latency problem )
    I know the from win8 above such DCP latency issues from the HW ( I.E ACPI timers ) were solve by the OS itself.
    but with win7.... things not so great.

    please see the following link: HERE to diagnose simply the issue...
    I know today that any such "simple" DPC diagnostic tools does NOT provides the best real/correct info ( at least for win8 and above )- as only windows diagnostic tools ( some sdk ) is the nearest to the "truth".

    As a quick fix - please try to use the following: TIMERTOOL to lower your DPC Latency.

    As an interesting anecdote, the following provided:
    I know that using such tools on my retired Asus G55VW with win8 x64 did not help to get better FPS, as it is a problem with how win8 and above are built ( using this tool actually lowered FPS in "PCMark Vantage" benchmark app ).
    I know this, cause I tested it myself with some scientifically technique called "factorial design" - The idea in short is that you perform about 1/10 tests then what you really should do - but from these small quantity but well planned repetitions, you can get results that statistically speaking are precise 99.5% like doing in addition the hole other 9/10 tests.
    The DPC latency "fixer" app I used back then was timer-resolution.
    I wanted to check the weight effect of DPC Latency fixer app (timer-resolution) on FPS.

    As the report was not written fully in English I provide only some of the results:
    The test planning:Click image for larger version. 

Name:	result_04_01.jpg 
Views:	1 
Size:	45.8 KB 
ID:	55280
    The results: Click image for larger version. 

Name:	result_01.jpg 
Views:	18 
Size:	60.7 KB 
ID:	55279Click image for larger version. 

Name:	result_02.jpg 
Views:	16 
Size:	24.4 KB 
ID:	55282
    The the results:Click image for larger version. 

Name:	result_03.jpg 
Views:	1 
Size:	36.0 KB 
ID:	55281
    you can see the the coefficients before "timerResolution" is much smaller then resolution it-self.
    Thus don't think that "fixing" DPC latency fixer apps will help you gain a lot of FPS, if at all :-)

  7. #7
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    Quote Originally Posted by Gps3dx View Post
    well.. I know that drivers & apps ( nvidia specificly ) can rise your DPC latency - which is a "bug" state of these drivers/apps.
    nontheless, the Windows itself is also part of the blam. ( i.e with win8 and above, on same HW, you won't necessary be getting this DCP latency problem )
    I know the from win8 above such DCP latency issues from the HW ( I.E ACPI timers ) were solve by the OS itself.
    but with win7.... things not so great.

    please see the following link: HERE to diagnose simply the issue...
    I know today that any such "simple" DPC diagnostic tools does NOT provides the best real/correct info ( at least for win8 and above )- as only windows diagnostic tools ( some sdk ) is the nearest to the "truth".

    As a quick fix - please try to use the following: TIMERTOOL to lower your DPC Latency.

    As an interesting anecdote, the following provided:
    I know that using such tools on my retired Asus G55VW with win8 x64 did not help to get better FPS, as it is a problem with how win8 and above are built ( using this tool actually lowered FPS in "PCMark Vantage" benchmark app ).
    I know this, cause I tested it myself with some scientifically technique called "factorial design" - The idea in short is that you perform about 1/10 tests then what you really should do - but from these small quantity but well planned repetitions, you can get results that statistically speaking are precise 99.5% like doing in addition the hole other 9/10 tests.
    The DPC latency "fixer" app I used back then was timer-resolution.
    I wanted to check the weight effect of DPC Latency fixer app (timer-resolution) on FPS.

    As the report was not written fully in English I provide only some of the results:
    The test planning:Click image for larger version. 

Name:	result_04_01.jpg 
Views:	1 
Size:	45.8 KB 
ID:	55280
    The results: Click image for larger version. 

Name:	result_01.jpg 
Views:	18 
Size:	60.7 KB 
ID:	55279Click image for larger version. 

Name:	result_02.jpg 
Views:	16 
Size:	24.4 KB 
ID:	55282
    The the results:Click image for larger version. 

Name:	result_03.jpg 
Views:	1 
Size:	36.0 KB 
ID:	55281
    you can see the the coefficients before "timerResolution" is much smaller then resolution it-self.
    Thus don't think that "fixing" DPC latency fixer apps will help you gain a lot of FPS, if at all :-)
    I've already profiled the system and used the tools above all of them had random usefulness. The tools itself sometimes cause DPC delays. I tried the timer fix but as I was suspected that did not help since the problem is that we spend too much time in interrupt context. With the newest Nvidia driver things are horrible - running carvisualizer.plus360degrees.com made DPC to go over 1000micro seconds. So far things are much better with the old driver - I rarely see spikes above 1000. Win7 might be part of the problem but why old driver works sort of ok while the new driver brings the whole system under heavy DPC latency? I still believe Nvidia has work to do and it would be nice if they test before releasing or incorporate better QA process.

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