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Thread: EMU 0404 USB high CPU load for Deferred Procedure Calls

  1. #1

    Exclamation EMU 0404 USB high CPU load for Deferred Procedure Calls

    Hello, i`m using a Emu 0404 USB with Winxp SP3 and found strange, Driver related issues.

    As EMU states it`s Products are for Professionals > i`m one of these guys

    So lets go:
    I`ve found out that the EMU 0404 USB (latest Drivers & firmware are installed, usb port where the 0404 is connected not changed since installation) uses high CPU % for DPC`s (deferred procedure calls).


    It`s been tested with 3 different Pc`s. Two were using Intel ICH7 Chipset for the USB part and i`ve also tested it with a Intel ICH8 (there was no irq sharing!)

    * Grapicscardacceleration was set to stage 1 in advanced display settings.

    * Lan, Wlan, Cdrom, Esata, Motherboard Onboard Audiochip etc. > disabled

    No problems shown in DPC Latency Checker tool!! latency is low


    But and here is the issue:

    Sysinternals Process Explorer clearly shows, that the CPU load for DPC`s is going up to 10-15% when playing ASIO audio through the EMU 0404 USB. dpc latency is also going up a little bit which is normal instead of the 10-15% cpu load.


    If i open the Sequencer (also tested with different sequencers + winamp using asio) the CPU load for DPC`s is going nuts!

    So it`s not relevant if audio is playing or not! The DPC stuff starts when the usb 0404 is set up for playing audio by any audiosoftware.

    Normally the CPU load for DPC`s at all three pc`s is between 0,7 - 2,6%.


    I`ve additionaly tested with a firewire interface Motu 828mk3 where the DPC`s CPU load is going to a overall maximum of 3,3% when playing audio!

    So something is going wrong here. see attached picture

    @ ALL >>> wan`t to check on your pc?
    1) download Sysinternals Process Explorer v15.13 (Standalone no installation required
    http://technet.microsoft.com/en-us/s...rnals/bb896653

    2) check the dpc`s cpu load in process explorer while no audiosoftware is running.
    it should be near to 0-3% (peaks) otherwise your pc has another problem

    3) start any audiosoftware using the 0404 usb asio drivers and watch the dpc`s cpu load again
    Attached Images Attached Images
    Last edited by acidrecords; 04-28-2012 at 06:58 AM.

  2. #2

    Re: EMU 0404 USB high CPU load for Deferred Procedure Calls

    Hello??? is this forum dead?

  3. #3

    Re: EMU 0404 USB high CPU load for Deferred Procedure Calls

    e-mu sucks I regret the day I bought my 0404usb

    So much driver trouble on win7 x64...


    I hope somebody answers but I kinda feel it will go unanswered

  4. #4

    Re: EMU 0404 USB high CPU load for Deferred Procedure Calls

    i`ve seen what you mean. 2years ago announcement regaring new win7 drivers. since then only beta drivers. what is here professional?

  5. #5

    Re: EMU 0404 USB high CPU load for Deferred Procedure Calls

    @ Rikko
    are you running daemon tools on your machine?

  6. #6

    Re: EMU 0404 USB high CPU load for Deferred Procedure Calls

    Quote Originally Posted by acidrecords View Post
    @ Rikko
    are you running daemon tools on your machine?
    Nope...but it is cleary win7 x64 driver issue. I tested with 3 computers and performed clean reinstalls of both x32 and x64 win7.

    But it doesnt matter anymore since I sold it...thanks for the help anyway

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