The performance regression was documented in testing of the Linux 7.0 kernel. The AWS engineer observed a 50% drop in PostgreSQL throughput. (https://www.phoronix.com/news/Linux-7.0-AWS-PostgreSQL-Drop)

Kernel changes in Linux 7.0 are cited as the source of the halved performance. The report states a fix may not be easy. (https://www.phoronix.com/news/Linux-7.0-AWS-PostgreSQL-Drop)

The findings are based solely on the engineer's benchmarks shared with Phoronix. No other primary sources were referenced in the coverage. (https://www.phoronix.com/news/Linux-7.0-AWS-PostgreSQL-Drop)