a warning in percona server 5.6 error log

according https://www.percona.com/blog/201 … percona-server-5-6/ zhis blog.

I agree wiht contribution.
but,I set my.cnf file with below parameters to install percona server 5.6:

innodb_adaptive_hash_index_partitions=65

in error log ,i got some warning information as follows;

----------------------------------warning---------------------------------------------

2016-02-16 16:05:23 0 [Note] /usr/sbin/mysqld (mysqld 5.6.28-76.1-log) starting as process 23043 …
InnoDB: Warning: innodb_log_block_size has been changed from default value 512. (###EXPERIMENTAL### operation)
InnoDB: The log block size is set to 4096.

2016-02-16 16:05:24 23043 [Warning] InnoDB: Setting thread 23074 nice to -20 failed, current nice 0, errno 13
2016-02-16 16:05:24 23043 [Warning] InnoDB: Setting thread 23075 nice to -20 failed, current nice 0, errno 13


this above phenomenon is normal?