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Author Topic: Ryzen CPU core appointment scheme  (Read 246 times)
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numlog
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« on: November 13, 2019, 10:59:58 am »

I have kind of moved away from PC for music playback in favour of a simple SD card player but thought this is worth suggesting as a feature for a future version of XXHE.

Ryzen CPUs use groups of 4 cores each with their own cache (CCX) that are linked together to reach full core count (8,12,16), Intel generally has less cores which are built into a single ''package'' with one cache.

With AMD there is an issue of latency between the CCX groups which was shown to impact gaming performance.

However the internal core latency of the CCX is supposedly lower than Intel cores


Isolating the OS processes to one CCX and playback processes to another with AMD seems ideal but Im not sure if any software can utilize the CPU in this way?


I have noticed with Ryzen 1700 CPU usage is always spread over the 2 CCX, even at idle, it makes me wonder if music playback would be spread between the CCX too which kind of turns one potential advantage of the Ryzen CPU into a disadvantage.


Maybe with core appointment you can prevent that but
I dont think the current core appointment schemes in XXHE are oriented specifically towards this Ryzen core scheme to isolate between the CCX

I think there is some amount of interest in Ryzen 3000 for music servers and if XXhighend had options to effectively utilize 2 or even 3 CCX in a 12 core that could generate a lot of interest, XXHE is already a really good player on its own but that would push it even further above the others.
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PC: Ryzen 1700(Nofan), 2133MHz 2x4GB, GPU, Gigabyte A320
OS drive: Optane 16GB M.2, OS: S2019 Core,
modded PCIe SATA card + modded Juli@ XTE I2S output , Corsair Rm650x MoBo PSU, 12V CPU LPS .
PeterSt
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« Reply #1 on: November 13, 2019, 11:12:29 am »


Yes, interesting.

At this moment I don't think that any software can really influence what you are  talking about, and where it can, it has been done already (this is mainly in the XTweaks section, although not explicitly visible - the result depends highly on the combinations in there).
But what I would do (and btw, do indeed) is look into the BIOS settings, the C States and how they cause "interaction" at various levels. So, I would look into that anyway, and whether (API) code exists for that … I wonder. But it surely could exist. Point would be that it always would require a reboot to change those settings.

Best regards,
Peter
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For the Stealth III LPS PC :
W10-14393.0 - Oct 31, 2018 (2.10)
XXHighEnd Mach III Stealth LPS PC -> Xeon Scalable 14/28 core with Hyperthreading On (set to 10/20 cores) @~660MHz, 48GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 30/-/1/1/1/ Q1Factor = 10 / Dev.Buffer = 4096 / ClockRes = 15ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 140.19  (max 140.19) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / OSD Off (!) / Running Time Off / Minimize OS / XTweaks : Balanced Load = 35 / Nervous Rate = 10 / Cool when Idle = n.a / Provide Stable Power = 0 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / *Arc Prediction Filtering (16x)* / Always Clear Proxy before Playback = On -> USB3 from MoBo -> Lush^2*A:B-W-Y-R, B:B-W-R* USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (16ms) -> B'ASS Current Amplifier -> *Blaxius^2 A:B-R, B:B-R* Interlink -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere (also from the PC).

For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.

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