# Percona 5.5 on Xen and KVM - memory issue

**URL:** <https://forums.percona.com/t/percona-5-5-on-xen-and-kvm-memory-issue/2847>\
**Category:** Other MySQL® Questions\
**Created:** [July 27, 2013, 1:41pm UTC](https://forums.percona.com/t/percona-5-5-on-xen-and-kvm-memory-issue/2847 "2013-07-27T13:41:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gbshouse](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/gbshouse/32/948_2.png) [@gbshouse](https://forums.percona.com/u/gbshouse)\
**Post date:** [July 27, 2013, 1:41pm UTC](https://forums.percona.com/t/percona-5-5-on-xen-and-kvm-memory-issue/2847/1 "2013-07-27T13:41:20Z")

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Hello

Recently we have found some odd issue related to our environment. We have Percona 5.5 running on various virtual machines (all as slaves). All have the same parameters and use the same config file (from central repository). On Xen and VMware the memory usage is constant but on KVM it’s constantly growing up 90%. We have tried to tune it by setting the ‘innodb\_dict\_size\_limit’ but it didn’t help. Any suggestions?

Cheers  
Peter

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**Author:** ![przemek](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/przemek/32/3_2.png) [@przemek](https://forums.percona.com/u/przemek)\
**Post date:** [July 30, 2013, 2:18am UTC](https://forums.percona.com/t/percona-5-5-on-xen-and-kvm-memory-issue/2847/2 "2013-07-30T02:18:16Z")

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Hi,

By the memory usage you mean the mysqld process size? Is the workload the same as Xen and VMware VMs?  
innodb\_dict\_size\_limit matters only if you have large number of tables. The most relevant variables memory wise are InnoDB buffer pool, all the per-session buffers, MyISAM key cache, etc.  
What about memory section of show engine InnoDB status? Can you paste from both example VMs here to compare? Together with my.cnf files.