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#1
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HDX Doesn't Like To Run At Low Buffer Setting
Today I did some test to discover what causes the error that stops Pro Tools (don't remember, maybe the AAE 9071). Tried to remove all plugins from the plugin folder, deleted the pref and relunched PT that reinstalled its core plugins. Created a new session and imported 32 stereo files (from CDs). Without any plugins instantiated I wasn't able to run the session with the buffer under 128 samples. And at this buffer setting PT 12.8.3 that I have on Sierra ran with the CPU peaking around 45%. Did the same thing on HS partition where Ultimate is installed (2018.4). In this scenario the Cpu peaked the same but PT randomly stopped due to the aae error without any plugin instantiated. The weird thing is that by switching the playback engine to the build in line out the session ran flawless with the cpu peaking around the 6/7% and I was able to lower the buffer down to 64 samples (the 64 setting is not available on the HDX engine). Then, it seems that the HDX suffers the streaming from the dsp mixer to and from the cpu? Yes, I know that with the HDX the buffer setting does not influence on the in/out latency, but a high buffer give me latency when playing VI. And with a high buffer you could run out of latency comp when going back and forth from the cpu and the dsp mixer when using native plugins on busses and master.
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Avid HDX - Avid HD I/O 16x16 Analog - Pro Tools Ultimate 2023.6 - Nuendo 11 Mac Pro 5.1 2 esacore 2.66 64GB Ram - Mac OS 11.7.7 |
#2
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Re: HDX Doesn't Like To Run At Low Buffer Setting
Interesting very interesting, I hope Avid does these kinds of test as well.
I am betting it’s going to be worse for Avid and Apple once Apple drops intel CPU’s and goes solo......gheeze
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Daniel HDX - PT12.5.1 - HD I/O 16x8x8 Win10-Pro (v1709)- 6 Core i7-6850k - ASUS X99 Deluxe ii D-Command Main Unit - 'Ole Blue http://www.sknoteaudio.com/ plugins rock and are affordable. |
#3
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Re: HDX Doesn't Like To Run At Low Buffer Setting
I was under the impression that HDX didn't care what buffer and had low latency at all settings? What's the real story on that?
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HP Z4 workstation, Mbox Studio https://www.facebook.com/search/top/...0sound%20works The better I drink, the more I mix BTW, my name is Dave, but most people call me.........................Dave |
#4
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Re: HDX Doesn't Like To Run At Low Buffer Setting
He isn’t talking about latency issues - his main issue is with CPU’s usage of HDX vrs Mac Core Audio
Obviously high buffer settings even HDX increases Midi Latency (the PT reference manual even says as much) But he is describing problems related to CPU issues when running with HDX as the playback engine vs core Audio as the playback engine
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Daniel HDX - PT12.5.1 - HD I/O 16x8x8 Win10-Pro (v1709)- 6 Core i7-6850k - ASUS X99 Deluxe ii D-Command Main Unit - 'Ole Blue http://www.sknoteaudio.com/ plugins rock and are affordable. |
#5
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Re: HDX Doesn't Like To Run At Low Buffer Setting
Have issues also a 128 buffer size, again Mac 5,1 but with HDN, with Sierra and Ultimate.
Was hoping upgrading to HDX would've solve my issues, so this is not good news. Have been happy for the last 3 years running HDN, and no problem running low buffers with Yosemite and 12-12.8.1
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[B][SIZE="1"]System: PT 12.8.1 HD-Native PCIe, 48 I/O 16x16, 2012 Mac Pro 12 core 3.46Ghz 64gig RAM, UAD Quad FW, Apple 30” Cinema |
#6
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Re: HDX Doesn't Like To Run At Low Buffer Setting
Personally I don’t see the issues in Windows (thank God)
But it’s good to keep up with what’s happening Apple keeps moving the goal post and Avid keeps scrambling to keep up
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Daniel HDX - PT12.5.1 - HD I/O 16x8x8 Win10-Pro (v1709)- 6 Core i7-6850k - ASUS X99 Deluxe ii D-Command Main Unit - 'Ole Blue http://www.sknoteaudio.com/ plugins rock and are affordable. |
#7
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Re: HDX Doesn't Like To Run At Low Buffer Setting
If you switch to internal pc out do you see the same cpu loading?
I would add that at 1024 samples the cpu loading is the same between the hdx and the internal mac out. Btw your i7 is far ahead compared to my old machine. It would be interesting to see if it happens on previous systems. I don' remember this high intensive cpu loading when I was on pt11/yosemite, but didn't do this test.
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Avid HDX - Avid HD I/O 16x16 Analog - Pro Tools Ultimate 2023.6 - Nuendo 11 Mac Pro 5.1 2 esacore 2.66 64GB Ram - Mac OS 11.7.7 |
#8
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Re: HDX Doesn't Like To Run At Low Buffer Setting
From my experience this been the state of HDX since PT11. I have never been able to run reliably at a buffer lower than 256 without throwing cpu spikes that stop PT and report an error. Selecting “ignore errors on playback” in the playback engine helps. Avid has known about this issue for years and have yet to resolve it.
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Will Russell Electric Wilburland Studio https://linktr.ee/wilburland M1MAX Mac Studio OS 14.3, PT2023.12.1, HDX, S1/Dock M1 PRO MacBook Pro OS 14.3, PT2033.12.1, BabyFacePro FS |
#9
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Re: HDX Doesn't Like To Run At Low Buffer Setting
I would like to know why PT is able to run at low buffer when set to internal mac out. If the streaming from the cpu and the dsp mixer and vice versa is the cause of this, maybe the HDN shouldn't suffer from this given that the native card is a sw interface only and all processing and the mixer engine is handled by the cpu. Just my thought. It would be great if someone who own the HDN could do the test.
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Avid HDX - Avid HD I/O 16x16 Analog - Pro Tools Ultimate 2023.6 - Nuendo 11 Mac Pro 5.1 2 esacore 2.66 64GB Ram - Mac OS 11.7.7 |
#10
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Re: HDX Doesn't Like To Run At Low Buffer Setting
Quote:
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Avid HDX - Avid HD I/O 16x16 Analog - Pro Tools Ultimate 2023.6 - Nuendo 11 Mac Pro 5.1 2 esacore 2.66 64GB Ram - Mac OS 11.7.7 |
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