High latency in Linux KVM virtual machines

[cesarpk]

remove the cpu: config option, and add:

args: -cpu host,+x2apic

tablet: 0 (also available in gui options)

Many thanks spirit, works well

Please let me to do the last questions:

1- I have Several Linux as VM on PVE 2.3, since 2.4 kernel version until 2.6, for these VMs is advisable configure x2apic ???
2- And i will have soon Linux with 3.x kernel version as VM into my PVE 2.3, so must I configure the x2apic option?

Best regards
Cesar

Re:edit: Re-edit: I believe that enable x2apic is only necessary if the real "CPU" supports him. right?

 

[macday]

remove the cpu: config option, and add:

args: -cpu host,+x2apic

tablet: 0 (also available in gui options)

do I have to configure this too on my 3.0 pve ?

 

[spirit]

Many thanks spirit, works well

Please let me to do the last questions:

1- I have Several Linux as VM on PVE 2.3, since 2.4 kernel version until 2.6, for these VMs is advisable configure x2apic ???
2- And i will have soon Linux with 3.x kernel version as VM into my PVE 2.3, so must I configure the x2apic option?

It shouldn't reduce performance, but maybe not improve for old kernels. I don't have tested 2.4 kernels since a long time.

Re:edit: Re-edit: I believe that enable x2apic is only necessary if the real "CPU" supports him. right?

[/QUOTE]
No, you don't need to have cpu hardware support for this. (I have read it on qemu mailing list, can't retrieve the link)