Wasn't that hard to diagnose after checking log_group_write_buf that writes are aligned wrt. OS_FILE_LOG_BLOCK_SIZE. This block size is tunable only in Percona server with innodb-log-block-size.
So, the 'fix' is quite simply setting innodb-block-size to 4096.
4096 because it is the default log-block-size in ext4 and xfs.
Wasn't that hard to diagnose after checking log_group_write_buf that writes are aligned wrt. OS_FILE_ LOG_BLOCK_ SIZE. This block size is tunable only in Percona server with innodb- log-block- size.
So, the 'fix' is quite simply setting innodb-block-size to 4096.
4096 because it is the default log-block-size in ext4 and xfs.