Thanks for the suggestion Brian. I disabled the C states following this article and monitored things with Throttlestop following this forum thread (See post #36) article, changing the regkey as suggested https://www.techpowerup.com/forums/threads/cpu-throttling-at-high-performance-settings.221607/page-2
Extract: Code: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Intelppm Go to the above registry key and set Start to 4 to disable the C2/C3/C6/C7 low power core and package C states. Default value for this is 3. You will need to reboot to see any change. …” My machine was spending 70% of the time in C3, and virtually none in C6. Also experimented with Speedstep, Set_Multiplier, Turbo Disable, and C1E, these function when in C0 only mode. I can lock it down to a fixed frequency in C0 state only. None of these cured the problem though. Latency mon shows this machine has twice the latency number of my desktop, but still rates good. HDAudiobus.sys and ACPI are the usual top time users. I was able to get all the numbers down, but it had no effect on the problem. The only thing I have seen work at CPU <10% is WSPR2.12 and other programs like DM780 in Ham Radio Deluxe. This may also be a hardware or driver issue. It is a new design being a 8th gen core I5 box. For now I am running a Network Speedtest app in the background (idling) to get the CPU to 14, works fine then. * Mike K7MDL From: Brian Dickman <brian.dick...@gmail.com> Sent: Saturday, January 12, 2019 12:31 To: WSJT software development <wsjt-devel@lists.sourceforge.net> Subject: Re: [wsjt-devel] Odd Decoding Problem on new Core i5-8250 Laptop - Only decodes perfect when running HDSDR in parallel Mike, you might see what you can turn up using this tool. It goes way beyond the basic windows power management: https://www.techpowerup.com/download/techpowerup-throttlestop/<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.techpowerup.com%2Fdownload%2Ftechpowerup-throttlestop%2F&data=02%7C01%7C%7Cdcd9aa6d3ea44b61518608d678b431ac%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636829112660576273&sdata=iRbGrph5%2FNhctTcol5hfMXuX7iQIJFIjSvv%2BeExNkJM%3D&reserved=0> Start out by using it in a monitor-only mode, and get a feel for the C-state levels when you are successfully decoding vs failing. Then play with the performance level controls in the tool to see if you can coax the system into working decodes while it is otherwise idle. It feels like your system is either dropping into deeper C-states when it shouldn't (causing realtime latency that drops samples), or there's a driver bug that can't handle the C-state transitions properly, even when they would otherwise be safe. In either case, artificially forcing less C-states by using this tool may get you back to working. The cost is a small increase in power consumption of the CPU. It's also sometimes possible to change BIOS settings to limit package C-states; another way to resolve high latency issues at idle. This app is a bit less invasive than BIOS changes though, and will give better realtime feedback. -- Brian AF7MD On Sat, Jan 12, 2019 at 4:49 PM Mike Lewis <k7...@hotmail.com<mailto:k7...@hotmail.com>> wrote: Hi Bill, Tried check/unchecking them, no change. Uninstalled all 3 audio device drivers, rebooted, tested, updated 1 of the drivers, tested, no change. Running more tests today, quite a few last night. Does not have to be an audio program running to make things decode again, just need CPU load it seems now. Started with audio programs by chance, but moved on to other programs like weather and speedtest and solitaire apps to get the CPU over 10%. * Mike K7MDL From: Bill Somerville <g4...@classdesign.com<mailto:g4...@classdesign.com>> Sent: Saturday, January 12, 2019 05:31 To: wsjt-devel@lists.sourceforge.net<mailto:wsjt-devel@lists.sourceforge.net> Subject: Re: [wsjt-devel] Odd Decoding Problem on new Core i5-8250 Laptop - Only decodes perfect when running HDSDR in parallel On 12/01/2019 06:36, Black Michael via wsjt-devel wrote: I had a test session with one user who can easily reproduce the audio dropouts. Latency testing shows his system more than capable of handling realtime audio. I got some timings from the dataSink. The Good plot is a normal/good decode. One high time period is corrected on the next iteration. The plots show the time intervals between calls to dataSink. The Bad plot is when decoding has stopped. the n_ihsym never gets to 50 to satisfy the n_ihsym requirement if(m_ihsym == m_hsymStop) { Starting another program (most any one) will cause decoding to stop. Having another audio program start will cause decoding to start succeeding again. So the audio gets stalled periodically and sticks there until something tickles it. de Mike W9MDB Hi Mike, did you check the recording device advanced properties? Was the default sample rate set to 48000 Hz and did unchecking either or both of the "Exclusive Mode" options help? 73 Bill G4WJS. _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net<mailto:wsjt-devel@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/wsjt-devel<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Fwsjt-devel&data=02%7C01%7C%7Cdcd9aa6d3ea44b61518608d678b431ac%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636829112660576273&sdata=er8qzbekZHdntWKrrxm93vTOXz0VjZrYUIx%2BHxCY3HI%3D&reserved=0>
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