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Patches Provide For Much Faster In-Kernel Zstd Due To Embarrassingly Bad Inefficiency (www.phoronix.com)

submitted 3 days ago by cm0002@toast.ooo to c/linux@programming.dev

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[–] SteveTech@aussie.zone 4 points 3 days ago* (last edited 3 days ago)

It's only slightly faster. cpuid is a serialising instruction, which means all the instructions before it have to complete, removing any gains from pipelining and out of order execution. However for a VM this also triggers a VM exit, where the hypervisor takes over to modify the values for the guest.