With this Intel Thread Director Virtualization to ensure the VM can properly manage task placement between P and E cores, the feature ended up yielding around 14% better performance than the status quo. That 14% win was with the 3DMark benchmark running on a Windows VM.
You mean, they reduce the performance impact of meltdown&spectre fixes?
You forgot to mention the glibc/syslog backdoor discovered
Was it really a backdoor?
Backdoor implies it was deliberately put there. Looking at the CVE it does not seem intentional so just an exploit.
Are the latest generation (11th onwards) of Intel CPUs still affected by any of these two vulnerabilities?
Not by them directly but by other side channel attacks.
This is the best summary I could come up with:
Intel Thread Director support has come along with various Linux kernel improvements to better handle task placement between the P and E cores.
One area seeing new work now though is for virtual machines (VMs) running on Intel hybrid systems with a new Linux kernel patch series working on Thread Director Virtualization.
With this Intel Thread Director Virtualization to ensure the VM can properly manage task placement between P and E cores, the feature ended up yielding around 14% better performance than the status quo.
Our ITD virtualization is not bound to VMs’ hybrid topology or vCPUs’ CPU affinity.
To enable ITD related scheduling optimization in Win11 VM, some other thermal related support is also needed (HWP, CPPC), but we could emulate it with dummy value in the VMM (We’ll also be sending out extra patches in the future for these)."
Interesting work and hopefully this Intel Thread Director Virtualization support will be worked into shape for mainlining into the Linux kernel in the near future for further enhancing Intel Core hybrid CPUs.
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