Please report all spam threads, posts and suspicious members. We receive spam notifications and will take immediate action!
Page 23 of 26 FirstFirst ... 132122232425 ... LastLast
Results 221 to 230 of 255

Thread: P35 Motherboards and DPC Latency Spiking




  1. #221
    Join Date
    Sep 2008
    Posts
    10

    Default Re: P35 Motherboards and DPC Latency Spiking

    Please, I need help!!
    I did flash different versions of bios to try to solve the dpc latency issue and when I rebooted, the computer has entered in cycle reboot, What can I do?
    I can't enter in bios. Is there any way to flash Bios? (from usb, floppy, etc)
    Thanks again

  2. #222
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35 Motherboards and DPC Latency Spiking

    Quote Originally Posted by svcglobal View Post
    Yes, we tried the used of a emulator but it slow down the system too much and events above 4000 RPM can't be registered.
    The fixed electronic delay line is not a good solution since the latency is a variable event.
    Well, let's wait for a solution for a while - in the mean time we are using the old one (with ASUS mobo) that should be replaced by the new one...
    Hmm, well maybe dual boot? You guys test that out or do you think to many employees would have issues with it setup like that? I know it can scare some people

    Quote Originally Posted by theearbox View Post
    Please, I need help!!
    I did flash different versions of bios to try to solve the dpc latency issue and when I rebooted, the computer has entered in cycle reboot, What can I do?
    I can't enter in bios. Is there any way to flash Bios? (from usb, floppy, etc)
    Thanks again
    Sounds like you may have flashed the wrong BIOS for your model or revision. Have you tried removing all but one stick of ram in slot one? If not, start there for sure!

    Then if that does not work see the BIOS flashing thread for some additional help, like first try clearing the CMOS if the one ram stick does not work >>>
    http://forums.tweaktown.com/f69/bios...h-guide-27576/

    If you still get no where, please make a new thread with your full specs and I will try to help you further

  3. #223
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35 Motherboards and DPC Latency Spiking

    For the last few users who have posted about this issue, I have been informed that the BIOS's have been updated and all P35's should be corrected.

    Gigabyte says It was a very specific error causing the original problem in BIOS, which was corrected several months ago.

    So if you have the latest BIOS version and it is dated pre-April 08 let me know because the page for your model must have been missed in the update process.

    These things happen when updating many, many web pages at once.

    So again, if you are seeing a older BIOS only as the latest for your board model or revisions please PM me or post the model and revision and I will forward the word to Gigabyte

  4. #224
    Join Date
    Sep 2008
    Posts
    1

    Default Re: P35 Motherboards and DPC Latency Spiking

    GA-EP35-DS3 (rev. 2.1) / Bios F3

    After purchasing this mobo and installing OS i've issued "retriggered" sound from my audiocards (On-Board Azalia and M-Audio Audiophile 192) when playing winamp or playing 3d game. Its period is more than 2 times in a hour as minimum. That had never been noted on my old mobo Asus. Screenshot of "DPC Latency Checker" is in attached image. Red bar is a moment of sound stuttering (sounds like "trrrr" during ~1sec). My PC is using as DAW and this is drammatically sad. Does the engineers work on solving this problem or patching new BIOS or something?


  5. #225
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35 Motherboards and DPC Latency Spiking

    I have spoken with them, and it is fixed in the all the P35 latest BIOS's. So if you are having issues still it is either hardware/software or conflicting drivers.

    Have you tested this on a clean install? No other drivers loaded?

    Is your latest BIOS version Before April 08? I see it is 7/08 so it is the fixed BIOS.

    Here is Gigabyte's answer to me about this and why it is fixed for sure already on their end, and why you may still be affected by other issues and not the BIOS >>>

    Most people arenít affected and wouldnít even notice an issue, but panic scares in the forums have made them test and freak out when they see red. Iím not saying they arenít valid complaints, but latency issues can be caused by a numerous amount of things not related to BIOS. Anyway, the engineers say all recent BIOS on the GBT website should have the fix (we may have missed one or two, so if the BIOS version is pre-April 08, then let me know because it hasnít been updated with the fix).

    It was a very specific error causing the original problem in BIOS, which was corrected several months ago.

    If problems still persist, it is usually the fault drivers causing the latency. Otherwise it could be apps installed, HDs, basically could be anything, which is what makes it so frustrating for users and for us for replicating the issue. For the users who changed graphics card and now notice a problem, I would suggest they reinstall the latest drivers from vendor website, not package driver CD.

  6. #226
    Join Date
    Sep 2008
    Posts
    10

    Default Re: P35 Motherboards and DPC Latency Spiking

    Quote Originally Posted by Lsdmeasap View Post
    I have spoken with them, and it is fixed in the all the P35 latest BIOS's. So if you are having issues still it is either hardware/software or conflicting drivers.

    Have you tested this on a clean install? No other drivers loaded?

    Is your latest BIOS version Before April 08? I see it is 7/08 so it is the fixed BIOS.

    Here is Gigabyte's answer to me about this and why it is fixed for sure already on their end, and why you may still be affected by other issues and not the BIOS >>>
    Hi again, after a lot of days I have now a replaced MB, my model is now GA-EP35c-ds3r. I had the same configuration in a cheap asrock without any dpc spikes, same memory, graphic card, audio card, etc. For me is a shame that in my mails to gigabyte they told me "And for your information, because we did not find the DPC problem as you mentioned in our side"
    I hope that gigabyte will solve the problem soon,otherwise I will never buy another gigabyte product.
    If anyone can tell me any solution, please tell me, surely If I dont solve the problem I will kick my MB very far away.

  7. #227
    Join Date
    Sep 2008
    Posts
    10

    Default Re: P35 Motherboards and DPC Latency Spiking

    PD
    I tried a lot of bios without success, (beta included)
    Quote Originally Posted by theearbox View Post
    Hi again, after a lot of days I have now a replaced MB, my model is now GA-EP35c-ds3r. I had the same configuration in a cheap asrock without any dpc spikes, same memory, graphic card, audio card, etc. For me is a shame that in my mails to gigabyte they told me "And for your information, because we did not find the DPC problem as you mentioned in our side"
    I hope that gigabyte will solve the problem soon,otherwise I will never buy another gigabyte product.
    If anyone can tell me any solution, please tell me, surely If I dont solve the problem I will kick my MB very far away.

  8. #228
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35 Motherboards and DPC Latency Spiking

    Are you flashing properly? Loading optimized defaults and saving and applying after you flash? F3 and F4a are fixed as they are newer then April 08

    As noted above, ANY Driver or other hardware can cause this. The BIOS for that board is fixed so maybe the software or sound drivers, Network drivers, USB drivers, ect you are using cause it? I am not sure really, sorry but the BIOS is not to blame.

    Maybe you could return that board and get a P45 instead, DDR3 is kinda a waste of $$ right now. I Just wonder why you bought a DDR3 P35 board when you knew of this possible issue???

    P45 boards are fully working without a BIOS fix needed >>>



    More P45 discussion with images so you can see it is fine >>>>
    DPC issues still present in Gigabyte EP45 boards? - XtremeSystems Forums


    Sorry I cannot offer you more real help or suggestions, but I can assure you the BIOS is fixed and it has to be a hardware or driver issue on your end. Unless you are not properly flashing the BIOS

    DPC checker is extremely overrated.

    but lets go to the source shall we, as in RTFM from the DPC manual.


    1) DPC:Processing of streaming data in real-time is a very challenging task for Windows based applications and device drivers. This is because by design Windows is not a real-time operating system. There is no guarantee that certain (periodic) actions can be executed in a timely manner.

    scott: so as we near real time buffer setting IE 64 and 32 buffers we are pretty much maxing out the OS and i would add the physical limitations of hardware communication.

    2) DPC: Audio or video data streams transferred from or to an external device are typically handled by a kernel-mode device driver. Data processing in such device drivers is interrupt-driven. Typically, the external hardware periodically issues interrupts to request the driver to transfer the next block of data. In Windows NT based systems (Windows 2000 and better) there is a specific interrupt handling mechanism. A device driver cannot process data immediately in its interrupt routine.
    It has to schedule a Deferred Procedure Call (DPC) which basically is a callback routine that will be called by the operating system as soon as possible. Any data transfer performed by the device driver takes place in the context of this callback routine, named DPC for short.

    Scott: so take a poorly written driver for an audio interface and right off you can have DPC issues. this is why some interfaces can handle 64 or 32 buffer and others cant go below 512.

    so the only way to compare motherboards as a suspect issue is to have the identical setup, interface and windows install. this is called the scientific method in case you were asleep in college.
    this is excatly the method we use prior to ever posting a system on our site for sale.
    which by the way may or may not have Gigabyte boards (depending on the system)


    3) DPC: The operating system maintains DPCs scheduled by device drivers in a queue. There is one DPC queue per CPU available in the system. At certain points the kernel checks the DPC queue and if no interrupt is to be processed and no DPC is currently running the first DPC will be un-queued and executed. DPC queue processing happens before the dispatcher selects a thread and assigns the CPU to it. So, a Deferred Procedure Call has a higher priority than any thread in the system.

    again this can relate to A drivers or B software used.
    it can also be caused by a motherboard bios, how it address' resource allocation and upper memory range (beyond standard 32 bit OS) so even if you are using a 32bit the mobo can effect you with these upper reagions
    not used as now all new hardware is Vista certified.
    this can appear on ANY mobo as alot are more concerned with Vista approval than worrying over legacy support.

    4) DPC: While there is a pre-emptive multitasking for threads, DPCs are executed
    sequentially according to the first in, first out nature of a DPC queue.
    Thus, a sort of cooperative multitasking scheme exists for Deferred
    Procedure Calls. If any DPC runs for an excessive amount of time then
    other DPCs will be delayed by that amount of time. Consequently, the
    latency of a particular DPC is defined as the sum of the execution time
    of all DPCs queued in front of that DPC. In order to achieve reasonable
    DPC latencies, in the Windows Device Driver Kit (DDK) documentation
    Microsoft recommends to return from a DPC routine as quick as possible.
    Any lengthy operation and specifically loops that wait for a hardware
    state change (polling) are strongly discouraged.



    Unfortunately, many existing device drivers do not conform to this
    advice. Such drivers spend an excessive amount of time in their DPC
    routines, causing an exceptional large latency for any other driver's
    DPCs. For a device driver that handles data streams in real-time it is
    crucial that a DPC scheduled from its interrupt routine is executed
    before the hardware issues the next interrupt. If the DPC is delayed and
    runs after the next interrupt occurred, typically a hardware buffer
    overrun occurs and the flow of data is interrupted. A drop-out occurs.

    Scott:
    there are numerous causes for high DPC, aside from lousy drivers.
    the netwarok card is most noted for this, and a wireless NIC is 10 times worse.

    enabling AHCI for your drives will most definately cause this as well

    what IRQs are shared is again another issue.

    DPC checker is useless run a audio test. a real one like here

    D.A.W Bench : D.A.W Performance Benchmarking
    Source >>>
    Cubase.net .:::. View topic - The DPC latency thread... and Gigabyte P35/X38 issue

    http://www.thesycon.de/deu/latency_c...tml#background


    Here, and several of the linkbacks below you can go and read towards the end P35 Boards BIOS's are all fixed >>>
    RE: I'm shattered:( - my new useless super computer - GIGABYTE IS CRAP!
    Last edited by Lsdmeasap; 04-01-2009 at 03:58 PM.

  9. #229
    Join Date
    Sep 2008
    Posts
    10

    Default Re: P35 Motherboards and DPC Latency Spiking

    I have tested with the same configuration with a cheap asrock mb and it did not had any dpc issues.

    I did not knew the dpc problem before I bought it.
    I bought my MB in april.
    Thanks anyways again.
    Last edited by theearbox; 10-20-2008 at 03:55 AM.

  10. #230
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35 Motherboards and DPC Latency Spiking

    Sorry to be of no help I guess. You never said, are you Properly Flashing the BIOS when you update it? If you do not the problems will remain until you do a proper flash as noted above

Page 23 of 26 FirstFirst ... 132122232425 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •