Tag Archives: KVM Disk I/O slow

Performance issues with KVM – Redhat

The general performance issue with KVM is due to DISK I/O

– by default the Redhat KVM guest are created with x86_64 architecuture, if you installed 32 bit operating system change this to i686.

<type arch=’i686′ machine=’rhel5.6.0′>hvm</type>
<boot dev=’hd’/>

– Make sure the hypervisor used is correct in the configuration , either qemu or kvm

<domain type=’kvm’>


<domain type=’kvm’>

– Use virtio drivers if the guest is paravirtulized (http://www.ibm.com/developerworks/linux/library/l-virtio/index.html?ca=dgr-lnxw97Viriodth-LX&S_TACT=105AGX59&S_CMP=grlnxw97 http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=/liaat/liaatbpparavirt.htm)