1 (edited by mturns 2019-03-23 11:00:10)

Topic: Glitches at Higher Buffer Size

I'm having an issue where raising the buffer size above 32 samples causes significant glitches.

32 samples works fine with occasional glitches but for mixing I want to be able to set it to handle multiple fx without glitches.

Does anyone have any idea what might be causing this issues? Any help would be much appreciated!

I am using Reaper with around 7 tracks and 20fx in total. I have 2 instances of ReaInsert within this (seems like this behaves in weird ways sometimes)
I'm using an RME UFX II
My system is
OS Name    Microsoft Windows 10 Pro
Version    10.0.17134 Build 17134
Other OS Description     Not Available
OS Manufacturer    Microsoft Corporation
System Name    DESKTOP-DHG0UAF
System Manufacturer    System manufacturer
System Model    ROG STRIX Z390-E GAMING
System Type    x64-based PC
System SKU    SKU
Processor    Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz, 3600 Mhz, 8 Core(s), 16 Logical Processor(s)
BIOS Version/Date    American Megatrends Inc. 0506, 20/09/2018
SMBIOS Version    3.1
Embedded Controller Version    255.255
BIOS Mode    UEFI
BaseBoard Manufacturer    ASUSTeK COMPUTER INC.
BaseBoard Model    Not Available
BaseBoard Name    Base Board
Platform Role    Desktop
Secure Boot State    Off
PCR7 Configuration    Binding Not Possible
Windows Directory    C:\Windows
System Directory    C:\Windows\system32
Boot Device    \Device\HarddiskVolume4
Locale    United Kingdom
Hardware Abstraction Layer    Version = "10.0.17134.619"
Time Zone    AUS Eastern Summer Time
Installed Physical Memory (RAM)    32.0 GB
Total Physical Memory    31.9 GB
Available Physical Memory    28.4 GB
Total Virtual Memory    36.7 GB
Available Virtual Memory    31.3 GB
Page File Space    4.75 GB
Page File    C:\pagefile.sys
Kernel DMA Protection    Off
Virtualisation-based security    Not enabled
Device Encryption Support    Reasons for failed automatic device encryption: TPM is not usable, PCR7 binding is not supported, Hardware Security Test Interface failed and the device is not InstantGo, Un-allowed DMA-capable bus/device(s) detected, TPM is not usable
Hyper-V - VM Monitor Mode Extensions    Yes
Hyper-V - Second Level Address Translation Extensions    Yes
Hyper-V - Virtualisation Enabled in Firmware    No
Hyper-V - Data Execution Protection    Yes

Re: Glitches at Higher Buffer Size

According to manual all USB ports seem to come from the Intel chipset.
So we can exclude issues in the range of bogus 3rd party USB chips.

It's remarkable that you report that the issue increases with bigger ASIO buffer sizes.
Normally bigger ASIO buffersizes cure audio drops and lower the load on CPU.

How long is your USB cable and what cable do you use ?

Please check in the RME settings dialog, whether the RME driver reports transport errors.
You need to keep the settings window open to keep USB diagnosis running.

You could also try all USB ports, whether the result is the same for all other USB 2 / 3 / 3.1 ports.
If there are no CRC errors then the cable / the data transport should be fine.
Nevertheless, to be on the safe side, I would re-do checks with a different USB cable.

Do you get the issues only when using the ASIO driver ? Is it the same when using WDM driver ?

If there is no USB transport error and if you use USB ports coming from chipsets, then the issue is either
the RME UFX II itself (which I do not think) or the issues come more likely from your system.
This needs more investigation in terms of BIOS / Windows Settings / Windows Version
Bad drivers or application blocking the CPU cores for too long because of bad programming.

BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13

Re: Glitches at Higher Buffer Size

Remove the ReaInsert instances for testing.
Disable all C-states in BIOS for testing.
Switch to the "High Performance" Windows power profile.