I ended up emailing Matt, the CEO as I have always found him excellent to deal with.
His response is that it could still be the effects of the Spectre and Meltdown patches and then Virtuozzo playing catchup with their software to deal with the knock on performance issues.
His email below.
Thank you for reaching out to me via email. Sorry to hear you’re experiencing issues with your server.
This may be still related to some of the Virtuozzo bugs we’ve been experiencing. We actually received an email from the Virtuozzo CEO earlier today. The email itself is long, but I want to show you one part of it:
“Finally, we continue to work to address the impact of the Spectre and Meltdown hardware-based vulnerabilities. Our priority is to ensure our customers have the latest information on the fixes and potential impact to your business. We know one of the biggest concerns has been around the performance issues associated with these fixes. We have been addressing the vulnerabilities proactively by sending email updates to subscribers. We recently released kernel with retpoline for Virtuozzo 6 which improves performance to near pre-Spectre level. A similar update for Virtuozzo 7 will soon be available. Look for additional email communication soon that will detail the results of this update.”
(We are using Virtuozzo 7).
You mentioned experiencing these issues for the past few months, it would coincide with the Spectre/Meltdown mitigations that were released in January/February. We are working hard to get these resolved.
Founder & CEO
I am still dealing with their tech support. They want to be able to reproduce the problems that I am seeing. I’m not sure what the best way to do this would be.