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killthespam

Help with CPU speed fluctuation with HT on please

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Just noticed on task manger WIN10 64 Z370 GaminPlus MB with I8700K OC @ 4.9 while HT on, CPU speed is bouncing up and down between 4.88 and 4.60.

Same settings but HT off (no other change) speed is constant at 4.88 and P3Dv4.2 is smooth. I don't understand what is creating this issue having in view that the only change is HT from ON to OFF. This CPU variation on speed is

creating stutters in P3Dv4.2. 

Any help is greatly appreciated.


Kind regards,

Alex Nic

Intel Core I9-9900K@5.0 GHz, Nvidia RTX 2080 Ti, Samsung 2 x  850 Evo 500GB, G.SKILL Trident Z DDR4 3200 64GB,WIN10 PRO 64

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13 hours ago, killthespam said:

Just noticed on task manger WIN10 64 Z370 GaminPlus MB with I8700K OC @ 4.9 while HT on, CPU speed is bouncing up and down between 4.88 and 4.60.

Same settings but HT off (no other change) speed is constant at 4.88 and P3Dv4.2 is smooth. I don't understand what is creating this issue having in view that the only change is HT from ON to OFF. This CPU variation on speed is

creating stutters in P3Dv4.2. 

Any help is greatly appreciated.

See if these forum posts helps you at all:  

 

Seems some are seeing better results with HT off.  Not sure if that's the majority as I currently run my 6700K with HT on and not really seeing the speed variation.  

 

Edited by DylanC

Dylan Charles

"The aircraft G-limits are only there in case there is another flight by that particular airplane. If subsequent flights do not appear likely, there are no G-limits."

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What you are experiencing can be indicative of running HyperThreading.  If you're desire is to run with HT on, then you'll likely have to play a bit with Affinity Mask settings to mitigate the effect you're experiencing.

Best wishes.

 


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15 hours ago, killthespam said:

Just noticed on task manger WIN10 64 Z370 GaminPlus MB with I8700K OC @ 4.9 while HT on, CPU speed is bouncing up and down between 4.88 and 4.60.

Same settings but HT off (no other change) speed is constant at 4.88 and P3Dv4.2 is smooth.

This has little to do with HT and everything to do with CPU Core Parking.  For simming you'll want to insure Core Parking is disabled.  More info here: http://www.overclock.net/forum/297-general-processor-discussions/1544554-core-parking-windows-disable-more-performance.html

and here:

The best utility (read: safest) for managing Core Parking is from Bitsum (the guy who makes Process Lasso): https://bitsum.com/parkcontrol/

I simply disable Core Parking in the Registry... there are better ways to save energy while computing.

HTH,

Greg


i7-8086K @ 5.3GHz, EVGA Z390 Dark, EVGA 2080 Super driving a 27" 2K LCD, G.Skill 32GB 3900 Trident Z 16-16-16, Samsung 512GB 970 Pro NVMe (OS and P3D) and Sabrent 1TB Rocket NVMe, Malware 10 Pro 64.  P3Dv4.5HF2

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Thank you folks!

What I don't understand is that I didn't have this issue before with HT on and now suddenly it looks like a problem. Very strange. 

Greg, thanks, I did disable Core Parking as you mentioned in registry, also used Lasso. Unfortunately I have the same results.

DaveCT2003 and DylanC, also thank you, it looks like there are two categories of people using HT differently with significant results. 

Again, your help and guidance is greatly appreciated.

 

 


Kind regards,

Alex Nic

Intel Core I9-9900K@5.0 GHz, Nvidia RTX 2080 Ti, Samsung 2 x  850 Evo 500GB, G.SKILL Trident Z DDR4 3200 64GB,WIN10 PRO 64

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7 hours ago, killthespam said:

What I don't understand is that I didn't have this issue before with HT on and now suddenly it looks like a problem. Very strange.

Could you clarify "before"?  When did this situation start?

Thanks,

Greg


i7-8086K @ 5.3GHz, EVGA Z390 Dark, EVGA 2080 Super driving a 27" 2K LCD, G.Skill 32GB 3900 Trident Z 16-16-16, Samsung 512GB 970 Pro NVMe (OS and P3D) and Sabrent 1TB Rocket NVMe, Malware 10 Pro 64.  P3Dv4.5HF2

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Certainly, I noticed this issue about 6 days ago while watching the  Task Manager. I had no updates, no changes whatsoever.

I was trying to figure out  why I have stutters on P3dV4.2, initially I checked  under windows-display settings to see if my monitor is still at 30 HZ (a few times it did change to a different number) and that was not the case. So I opened the Task Manager and noticed that issue with HT ON. I don't know why I just changed HT from on to off and no stutters at all.

I cannot find any explanation to this, I tried what  Greg, DaveCT2003 and DylanC mentioned and unfortunately no success.

On my MB I have:

CPU ratio mode is FIXED MODE

CPU ratio offset when running AVX = 0

Digi power - CPU loadline calibration control - MODE4

Intel C State = Disabled

CPU cores un-parked

 


Kind regards,

Alex Nic

Intel Core I9-9900K@5.0 GHz, Nvidia RTX 2080 Ti, Samsung 2 x  850 Evo 500GB, G.SKILL Trident Z DDR4 3200 64GB,WIN10 PRO 64

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Ht on , have you avx 3 ( see that you hve 0 ) set in bios or you trip the cpu powertarget with downclock as suposed, problem with VRM temp?

I have no problem to run my 8700k at 5.3ghz HT on , I run avx0 and extended Cpu power settings.

Cpu loadline have nothing to do with CPU powersettings , only to calibrate vcore during load

I Run ASUS not familar with GA bios on MoBos after Z97

Edited by westman

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Ok, I'll try avx at 3. Do you think that value will stop the cpu speed to fluctuate?

 


Kind regards,

Alex Nic

Intel Core I9-9900K@5.0 GHz, Nvidia RTX 2080 Ti, Samsung 2 x  850 Evo 500GB, G.SKILL Trident Z DDR4 3200 64GB,WIN10 PRO 64

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2 hours ago, killthespam said:

Ok, I'll try avx at 3. Do you think that value will stop the cpu speed to fluctuate?

 

No it shall fluctulate 300mhz with 3 and no fluctulating with 0, that wy suspect that you exided the deafault power limit the CPU clock itself down , you have small avx bursts in p3d that reqest more power then when it no avx the powerdraw decrease and cpu clock back to 4.9.

the powerdraw is much lower with HT off and not trip the Cpu powerlimit.

you have both thermal ( overheat) and power limits

my eng is bad , hope you get it

Edited by westman

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Yes I understand what you say, thank you. Interesting, in XP11 I don't see this issue, all the cores are almost even and no spikes at all.

Again, many thanks.


Kind regards,

Alex Nic

Intel Core I9-9900K@5.0 GHz, Nvidia RTX 2080 Ti, Samsung 2 x  850 Evo 500GB, G.SKILL Trident Z DDR4 3200 64GB,WIN10 PRO 64

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3 hours ago, killthespam said:

Yes I understand what you say, thank you. Interesting, in XP11 I don't see this issue, all the cores are almost even and no spikes at all.

Again, many thanks.

Does XPlane use AVX extensions? If not, that would would explain it.


    ROG Maximus X Apex Z370 -- 8086 @ 5.3 / NB 5.0 -- GSkill  @ 4133 c17-17-32~Cr1 1.42v  -- EVGA 1080Ti 6393 -- ROG PG279Q 1440P 150hz -- Corsair H100i V2 --Samsung EVO 850(s) -- Windows7 Pro 64 --Corsair 750X

Ken C

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Interesting question, just found this, I don't know if is true or not from plane org:

The last time anyone from LR answered a question about AVX use (early last year), the answer was that they don't use AVX, but SSE2 instead because there was no advantage in using AVX in XP at that time. I don't see any evidence that's changed, and it certainly isn't where development efforts are right now, or where they've been since that time.

I have not seen any evidence that AVX is used by XP alone. However, Windows itself uses it in the background, not a lot, but it's noticeable. If you have an AVX offset in your OC profile, monitor the CPU clocks real time and you will see it drop intermittently by the offset amount. I have also not seen any evidence that Windows AVX use is causing the feared 25 to 30% voltage or big temp spikes on my rig, so I created an OC profile for XP with zero AVX offset. For now at least, I don't run other apps on that rig, so I'm not too worried about spikes. However, if I decide to do some 4K video rendering on that PC for whatever reason, then I will make a profile with a -2 or -3 offset. It does make a difference. On my binned/delidded 8700K at 5.3, Windows AVX was causing measurable FPS drops when it kicked in and dropped the freq by the offset amount.

Earlier this year, a number of people who bought binned chips guaranteed at a given clock speed were complaining that they were seeing random drops in clocks well below the advertised speed, even though they had set everything to run flat out 100% of the time. Turns out, they (including me) were all following the binners' advice about the -2 or -3 offset, and that is the exact amount the clocks were dropping. The drops were caused by the offset by Windows. That's straight from the horse's mouth (two of the best known binners). Nevertheless, it's still something to keep an eye on for sure.

 


Kind regards,

Alex Nic

Intel Core I9-9900K@5.0 GHz, Nvidia RTX 2080 Ti, Samsung 2 x  850 Evo 500GB, G.SKILL Trident Z DDR4 3200 64GB,WIN10 PRO 64

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