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Linux 5.13 To Address Some Networking Overhead Caused By Retpolines

Submitted by Roy Schestowitz on Sunday 21st of March 2021 09:02:49 PM Filed under
Linux

It's been three years that Retpolines (return trampolines) have been around as part of the Spectre defenses on Linux and kernel developers in particular are still working to better optimize different areas of their code to deal with the performance overhead incurred.

With the current Linux 5.12 cycle there is an important change to the AES-NI crypto code to overcome the overhead introduced by enabling Retpolines on older Intel systems and old through current AMD hardware where this is needed as part of Spectre V2 mitigations. Those AES-NI code changes in Linux 5.12 for avoiding indirect calls makes a big performance improvement for cryptsetup on Retpolines-enabled hardware. Now with Linux 5.13, the networking subsystem is seeing some tuning to also avoid Retpoline costs.

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