Poor W10 performance

chocorem

New Member
Aug 21, 2021
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Hello,

I'm pretty new ar Proxmox, but wanted to test this environement to maybe migrate my lab from Unraid to Proxmox.

I have installed proxmox on my test server (IBM X3650 M1 with 2 xeon 5460 and 24gb of RAM, LSI HBA card and netapp 4246 disk shelf full with 24 Gb 450gb SAS drives)
Promox is installed on a consumer SSD Samsung Ultra II ( I also tested with 450gb Disk)

I first installed a VM with TrueNAS and get saturation of the 1gb network (my 3650 does not boot with 10gb card installed ...unfortunately)

I then installed a Windows 10 machine to test the speed to true NAS. Windows is installed with all the Virio drivers and I ried
- Passthrough Disk, Passtrough SSD
- Installation on The SDD LVM (with or without SSD emulation)
- installation of a Raidz array of several 450gb of the diskshelf (with or without SSD emulation)
- with ou without cache (write back)
- no matter what the write speed is limited to 40 to 50MB/s (source network or proxmox TrueNAS)
- The read speed is alsso limited but a little higher

I tried Iperf from TrueNAS to W10, I get 8 to 9 Gb/s , iperf from W10 to Unraid, 950Mb/s

So TrueNAS is working at lease at a Gb connection (cannot test higher) but if the target or the source is W10, perf sucks

a crystal disk on the W10 drive is showing bad perf on RDM4k (50MB/s)

The last try I made was to put this SSD in unraid as an unassigned device, installed a W10 VM on it and get 600MB/s speed to the unraid cache . So the SSD is not the problem.

I read a lot of post about W10 speed problem, that pight be solved by enabling cache or virtio driver provlem. but here this did not solve the issue.

am I missing something ?
 
Please post your VM config (qm config <vmid>) and pveversion -v output. There's a number of reasons why a VM could be slow, not least is the guest - have you tried with a Linux VM?