8 Replies Latest reply on Sep 24, 2015 11:10 AM by SotY Branched from an earlier discussion.

    Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs

    SotY

      Same problem here for 7265 AC when high transfer rate over wifi (~20MB/s) especially when uploading. It's Dell Latitude E5550 with i7-5600U running Windows 10 x64 and latest 18.20.0 drivers.

        • 1. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
          Sandy_Intel

          Hi SotY,

           

          Thank you for contacting Intel.  I have moved your post to our Wireless Support Group.  They will be able to assist you with this.

           

          Sincerely,

           

          Sandy

          • 2. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
            aleki_intel

            SotY,

             

            How did you identify that the Intel(R) Drivers are responsible for this issue? DPC latency that high could indicate a problem with the BIOS. Please check with the BIOS manufacturer for any updates. As you know, DPC is the part of Windows* that handles driver efficiency. Usually, a driver that is taking longer than normal to process, may prevent other drivers from being processed in time. There are thirdy-party tools out there that you can use to identify more accurartely the problematic driver that is causing the latency such is the LatencyMon by Resplendence*. Here is the link for you to check it out: Resplendence Software - LatencyMon: suitability checker for real-time audio and other tasks

            *NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.

             

            You may also want to take a look at the thread: AC 7260 frequent ping spikes post number 45 where you can see a similar issue. You may find good answer there.

            • 3. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
              SotY

              1st screenshot showing latency with low WiFi traffic.

              1.PNG

               

              2nd screenshot showing latency with high RX WiFi traffic.

              2.PNG

               

              3rd screenshot showing latency with high TX WiFi traffic. You can clearly see latency spikes and music playing trough winamp is distorted every couple of seconds. Also 2 screenshots showing that ndis.sys is offending driver.

              3.PNG

              4.PNG

              5.PNG

              I think it's clear that something associated with WiFi is causing latency problems.

               

              I have Windows 10 location services completely turned off. The same for p2p updates.

              • 4. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
                aleki_intel

                SotY,

                 

                Thank you for the detailed information. We are going to analyze and will get back to you as soon as possible.

                • 5. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
                  aleki_intel

                  Hello SotY,

                   

                  Regarding this issue, please change the channel on the router to see if an alternative channel provides a cleaner signal.

                  1 - How far are you from the router?

                  2 - Could please decribe what type of problem is the latency causing?

                   

                  Another thing that could be cause latency is the amount of programs running in the background. Try running a ping test using a much larger packet size in order to get more accurate readings. If your wireless card is the one that came installed by factory, we recommend that you contact your computer manufacturer first: listing of laptop manufacturer's websites. and check if they have any thing specifically for this adapter. Did this issue occur with the previous version of the Intel® PROSet/Wireless Software for Windows® 10 - File name: Wireless_18.12.4_Wind64.exe ?

                  • 6. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
                    SotY

                    Changing channel doesn't help and additionally my router is the only one running at 5GHz in the range of wifi card. Latency spikes causes distortion in sound playing at the same time (winamp, windows media player, mpc-hc for movies). I don't have any high demanding apps running in the background and on my screenshots you can see that cpu usage is very low when latency spikes happen. Laptop is around 20ft from router in straight line with no walls blocking signal. I can put laptop 3 ft from router and spikes will be the same. And it was also like that with previous version of drivers. Weird thing is that distortion in sound is much worse witch high TX traffic. There is some distortion with RX traffic but happens every 10 seconds or something like that and with TX with almost every 1-2s. I don't understand why should I contact computer manufacturer? It's Intel's wifi card and intel's drivers. Dell doesn't provide any custom made drivers for this card. Also this is regular oem card not modified in any way by Dell.

                    • 7. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
                      aleki_intel

                      SotY,

                       

                      Based on your later information we are going to investigate on it further. However, we would like to clarify that even though the card is Intel's, the drivers and support is to be provided by the OEM when it comes installed by factory as you can see this in details by accessing these links: Intel® Wi-Fi Products — Regulatory Information Regarding Hardware Installation or Upgrade and Wireless Networking — Installation Error when Installing or Swapping Intel Wireless Adapters

                       

                      The TX traffic is high usually when big amount of data is sent over the internet and RX during downloading or media streaming. If you are not using any bluetooth connected device, you may desable your Bluetooth as they use the same antennas used by your Wi-Fi and this can directly impact on the performance. Ambient interferences can also be the cause of high latency or jitter such as fluorecent lighting, wall paower lines, high power devices...etc.

                       

                      Have you updated your router firmware?

                      Have you check with the Winamp Technical Support. Here is the link: Winamp Support

                      Have you tried another player to see if the same thing happens?

                      Here are some tips you can try:

                       

                      • If applicable, disable 80211.b/g compatibility mode in the router. 802.11N routers often support the older 802.11 standards (a, b, g); supporting the old standards prevents the 802.11N from running as fast as it should, as the router has to periodically switch modes to check for older devices.
                      • Try moving the router to different places, other electornic devices may cause interference that can impact the radio link.
                      • Eliminate sources of interference. Malfunctioning equipment can generate a lot of RF.
                      • Disable “Automatic Channel Mode”. Some Routers have a mode that automatically looks for channels with less interference and will automatically change. While this sounds like a good idea, you will get a spike in latency when it does change its mind about which channel it wants to use. Experiment with different channels.
                      • The amount of equipment connected can also impact depending on the type of router.

                       

                      Alternatively, regarding the adapter, you can try the following:

                      Wireless Networking — What are the Recommended Settings for 802.11n Connectivity?

                      Intel® Wi-Fi Products — Quick Checks That Might Improve or Fix Connection Issues

                      Intel® Wi-Fi Products — Resolving Wi-Fi Network Connection Issues

                      • 8. Re: intel nic drivers 19.3 huge 6000+ dpc latency spike once a few secs
                        SotY

                        I have Asus RT-N66U router with latest firmware installed but I can verify if spikes happen with different router that I have at work.

                        Audio player has nothing to do with it because it happens with all audio sources (winamp, windows media player, mpc-he). Also I don't think that any radio interference have something to do with dpc latency spikes. Interference can lower wifi throughput or make network latency higher but not dpc latency. And I know what TX an RX means I generated high RX and TX to show you screenshots with latency spikes during specific transfer over wifi. And simple googling shows that I'm not the only one who has problems with dpc latency on different Intel wireless and wired network cards. Some people had luck with different version of Intel drivers so I guess that's main reason dpc talency spikes happen in first place. But there is not lot of choices for 7265 AC and Windows 10 right now. I have Bluetooth mouse so I will try to disable bluetooth controller and check it that helps. But bluetooth is also using Intel drivers so if that's the case we are going back to the roots of this problem: intel drivers.