EMU 0404 USB high CPU load for Deferred Procedure Calls

[acidrecords]

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

[acidrecords]

Hello??? is this forum dead?

[Rikko]

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

[acidrecords]

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

[acidrecords]

@ Rikko
are you running daemon tools on your machine?

[Rikko]

@ 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