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A comment on PCID is now a critical performance/security feature on x86.
The main performance numbers I've seen so far are from two kinds of sources:
1. Local benchmarks like the Phoronix benchmarks, which I think are all on physical hardware with PCID.
2. Reports from cloud customers like https://forums.aws.amazon.com/thread.jspa?threadID=269858 and https://twitter.com/chanian/status/949457156071288833. These are with a patched host, but with an unpatched guest OS. The best case scenario here seems to be that it doesn't degrade much further when the guest OS is patched.
I don't think I've seen any numbers yet for AWS with a patched guest OS - this would be interesting to see on instances with and without PCID support.
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The main performance numbers I've seen so far are from two kinds of sources:
1. Local benchmarks like the Phoronix benchmarks, which I think are all on physical hardware with PCID.
2. Reports from cloud customers like https://forums.aws.amazon.com/thread.jspa?threadID=269858 and https://twitter.com/chanian/status/949457156071288833. These are with a patched host, but with an unpatched guest OS. The best case scenario here seems to be that it doesn't degrade much further when the guest OS is patched.
I don't think I've seen any numbers yet for AWS with a patched guest OS - this would be interesting to see on instances with and without PCID support.