Much is being talked about the latest vulnerability mitigations on L1 cache for IBM POWER processors addressed in CVE-2020–4788.

Update on 23/11: This post has been updated to address Pgbench tests that provides more realistic numbers related to the CVE and mitigations. Check the PGbench section below.

The intent of this post is to run some preliminary benchmarks with and without such mitigations. There is no scientific method for the tests other than full reboots and replication of the scenarios between versions. For complete tests, check out in the future for Phoronix benchmarks.

The tests were performed on a Raptor Computing Systems Blackbird with a 4-core, 16-thread POWER9 CPU (02CY650) and 8GB RAM. …










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Carlos Eduardo

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