Re: [Xen-devel] How to reduce high latency on PV-on-HVM?

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 4 Jan 2011, shen.qilong wrote:
> AboutÂpingÂlatencyÂinÂPV-on-HVM
> IÂhadÂtriedÂa test toÂpingÂbetweenÂtwoÂVM(PV-on-HVM)ÂinÂtheÂsameÂhost server 
> with bridge model.
> Â
> I think there would be slightly latency mostly(less than 1ms).
> But IÂfoundÂthatÂthere are too muchÂhighÂlatency package (moreÂthanÂ1ms) inÂ
> PV-on-HVMÂ+ÂbridgeÂenvironment.
> Â
> Â
> The following is the test environment and the test result:
> Â
> ServerÂusesÂxen-4.0.0,Âdomain-0ÂisÂkernel-2.6.32.13ÂandÂPV-on-HVMÂisÂ
> kernel-2.6.x.Â
> TheÂserverÂandÂclientÂareÂconnectedÂthroughÂaÂsameÂnetworkÂbridge.Â
> Â
> Can someone help me, or tell me something?

If you boot your guest kernel with loglevel=9, can you see the following line
among the boot messages?

Xen HVM callback vector for event delivery is enabled

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