January 6, 20251 yr Hi, im running Unraid since years now, and from time to time i´ve got more services up on the server. One is Plex, which is shared with my family, and i´ve also set up a gaming VM for my wife. The Servers Hardware should be beefy enough to handle the workload, especially as i isolated (at least i think so) everything from each other. Now i found, that when playing a movie which requires transcoding (hw transcoding using the iGPU), the performance inside of the VM drops. For example, the FPS drop from 90 to 15. As soon as i switch to direct play or stop the movie, the performance goes up again. Any help or ideas what could cause this would be great. Hardware is: i9-10900 (10Cores, 20 Threads) 64GB DDR4 RAM Cache on m.2 NVMe SSD Dedicated SSDs for the VM RTX 4070 for the VM LSI? SAS card running in IT mode with 5 HDDs attached I´ve bound the RTX 4070 to VFIO at boot and isolated 10 cores, which are assigned/passed trough to the VM. Plex is bound to 8 other cores. For transcoding it is using the RAM as storage (/transcode -> /dev/shm) Plex is using the iGPU for transcoding. Edited January 6, 20251 yr by CryPt00n
February 11, 20251 yr I'm noticing this as well on V7.0. the 4070 with a AMD 5600x isn't handling a single 4K transcode. Should be able to handle a few. I have a paid support session soon.
February 11, 20251 yr Author @TheScott do you use the 4070 for Hardware transcoding or for VMs? Your CPU has no integrated graphics, and I’m not sure, if the cpu can handle 4K transcoding. I’f I mention correct, mine i9 also can’t handle a 4K hdr transcode using just software transcoding. Its only working when using the integrated graphics card utilizing hardware transcoding.
February 11, 20251 yr I'm using the 4070 for transcoding. The CPU can handle a single transcode, barely, so I'm a bit more reliant on ensuring the GPU is up to the task of transcoding. Per the information out in the wild, the 4070 should be able to handle a fair bit. The 4070 is also a stop gap till I can put in the Arc b580 that's tested for 12 non HDR streams and 3 HDR streams from 4k to 720p.
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