# InnoDB not using CPU crc32 instructions

**URL:** <https://forums.percona.com/t/innodb-not-using-cpu-crc32-instructions/3854>\
**Category:** Percona Server for MySQL 5.6\
**Created:** [November 5, 2014, 4:31am UTC](https://forums.percona.com/t/innodb-not-using-cpu-crc32-instructions/3854 "2014-11-05T04:31:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pszajna](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@pszajna](https://forums.percona.com/u/pszajna)\
**Post date:** [November 5, 2014, 4:31am UTC](https://forums.percona.com/t/innodb-not-using-cpu-crc32-instructions/3854/1 "2014-11-05T04:31:26Z")

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My error.log notes that InnoDB: Not using CPU crc32 instructions, I’ve added innodb-checksum-algorithm = crc32 to my.cnf but didn’t help. Server is running on Debian Wheezy on VirtualBox, can anybody give me an advice why?

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<div class="post-metadata">

**Author:** ![pszajna](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@pszajna](https://forums.percona.com/u/pszajna)\
**Post date:** [November 13, 2014, 2:00am UTC](https://forums.percona.com/t/innodb-not-using-cpu-crc32-instructions/3854/2 "2014-11-13T02:00:54Z")

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Self answer: it’s VirtualBox related ([url][Chapter&nbsp;9.&nbsp;Advanced Topics](https://www.virtualbox.org/manual/ch09.html#sse412passthrough%5B/url%5D)) through CPU supports sse4.2 it must be manually enabled for virtual machine.