February 4, 20251 yr I have a problem, I can't get good random read performance on my Windows VM. When I run the same test with identical settings on an Ubuntu VM, it performs very well. I'm using a vdisk (qcow2), but the issue persists even when using raw. Test results: Host: 80K IOPS Ubuntu VM: 70K IOPS Windows VM: 24K IOPS I also ran the same test on another Windows VM on a different machine, and there I got 100K IOPS, so test compatibility is not the issue. Is there anyone here who gets at least 50% of the host's performance in terms of I/O on a Windows VM?
February 5, 20251 yr Turn off "memory integrity" under core isolation settings. That massively improved performance on my win 11 vm's.
February 6, 20251 yr Author 15 hours ago, nerbonne said: Turn off "memory integrity" under core isolation settings. That massively improved performance on my win 11 vm's. Unfortunately have this off, but same situation occurs in Windows 10 machines. Managed to improve IOPS by switching to virtio-scsi (from virtio-blk), but it was not a leap, went from 24k to 30k, still not even a half of what Ubuntu VM gives.
February 9, 20251 yr I had Windows 11 VMs & the CPU is pegged at max with minimal activity and disk I/O is just unusable, switched to Windows 10 and all works fine. Tried tuning the Windows 11 VM but nothing seems to work.
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