Troubleshooting Session Slowness Complaints on RDS server

Posted by EmicationLikely@reddit | sysadmin | View on Reddit | 10 comments

We have a pretty new RDS server at a clients that will eventually be supporting about 12 simultaneous users. We currently have 3 users on the server and are getting slowness complaints. This is a Hyper-V VM and is currently the only VM on the host. Both the host and the VM are running Server 2022 (currently at 21H2). The specs on the host (Dell R940) are: * 4 x Xeon Gold 6140 (72 Cores total) * 1.1TB RAM * 2 x 2TB SSDs in RAID1 for OS drive (800GB free) * 6 x 4TB SSDs in RAID10 for Data drive (where the redirected user folders are) * 4 x 25Gb Mellenox NIC, using 2 ports bonded for 50Gb to the main aggregation switch * No graphics card The specs of the RDS VM are: * 180GB OS drive (130GB free) * 9TB Data drive for the redirected user folders (8.75TB free) * 40 processor cores assigned (average usage 8%, spikes to 12 or 15%) * 800GB RAM assigned (average usage 30-40GB) * NIC usage 300-600Kbps average, haven't really seen spikes above that Only the RDS session host and Licensing roles are installed - No connection broker, RD Gateway or session collection. This is a run of the mill business - Outlook, Word & Excel are the main apps, plus a couple of SQL LOB apps (Separate AppServer for SQL is a VM on a different physical host with a 20Gb connection to the aggregation switch). There are about 40 employees total, with a dozen remote workers. The office has 800Mbps fiber connection (so up and down) and a Sonicwall TZ500 at the edge. A speed test on the RDS server just now showed 660 down and 620 up. The only adjustments I've made in the GP for Remote Session Environment is to limit the number of monitors available to 2. All 3 current users have dual monitors on the machines they use to connect to the server. I have considered getting a graphics card, but that's a project and don't want to go down that path without some obvious diagnostics pointing to that as a need. With these specs, this thing should NOT be slow, IMO. Since I see no resource bottlenecks, how can I troubleshoot these complaints?

10 Comments

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Gomeriah@reddit

https://borncity.com/win/2023/02/12/windows-server-2019-2022-terminal-server-rds-with-laggy-or-freezing-taskbar/ https://community.spiceworks.com/topic/2285411-server2019-rds-hundreds-of-firewall-rules-per-user-per-session https://learn.microsoft.com/en-us/answers/questions/752491/server-2022-and-teams-bloats-hkey-local-machinesys

EmicationLikely@reddit (OP)

Holy crap, I think that stupid Teams registry key was the problem. I also disabled UDP, so I broke the scientific method by changing 2 things at once, but the remote users are reporting much better performance! u/Gomeriah, you saved the day!

StevenNotEven@reddit

These are crazy good specs for the load. Get first hand witness on what's slow. Udp had been suggested for performance improvement ANDv no udp to fix performance issues. Try what you don't have I guess. Try reducing cores on VM to fit in one CPU to avoid numa

caponate@reddit

vGPU would make a world of difference. We aren’t even on SSDs and users have a great experience.

Assuming I can point the finger at graphics as the problem, how would you spec a card for this use? Something like a Quadro 4000? Or more of a gaming card? I've never put a graphics card in a HyperV host before - "regular" server VMs sure don't need them.

Wodaz@reddit

Disable udp for rdp. I run 35-40 users on servers running lob/sql apps. Using fslgogix for profiles, local printers on the rd session host for printing. vgpu is an option, but it depends on what is slow. Just being told its slow doesnt help.

BlackV@reddit

isnt the UDP thre to speed up the RDS connection? what does disabling it do?

Yes, I agree on the "it's slow" complaints. I have asked the complainers to benchmark a few things for me and to be more explicit. As for disabling UDP for RDP, is that done in GP on the host with the "Turn off UDP on Client" policy, or on the individual clients?

Sudsguts@reddit

I would be so happy to have a box like that down here. Have you lit everything up yourself, see which 'thing' is getting complaints? Office stuff should be a breeze. I'm thinking of your LOB's loading what from where?

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