@Andrew no way to fix it without hardware upgrade?
I experimented with TCS, try to switch to it from xen clock and disable emulation (vm kernel disable it as it unstable clock source), but no luck

@Andrew 10 or more times slower?

@AtaxyaNetwork no money
I switch to containers lxc or jail

@Danp debian-12 centos-7 centos-6 debian-10

Hi!
I have two DELL PE2950 servers with E5430@2.66GHz processors 32GB, both running XCP-ng 8.2.1.
I'm having issues with virtual machines performance.
I use local storage.

Its unsupported CPU?
The problem manifests itself when accessing individual files (or threads?), and is visible in top as approximately equal values ​​for %user and %system. %wait is close to zero (meaning it's not an I/O issue).
At the same time, on the hypervisor side, xentop shows load spikes up to 100% VM utilization.
The problem is easily reproducible using acme.sh.
The simple command acme.sh list takes seconds to execute inside the VM, but runs very quickly inside the hypervisor's bash shell.

Help please!