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Re: [Xen-users] Need for precisions on SAR measures
| To: | Nicolas80 <dedestri@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-users] Need for precisions on SAR measures |
| From: | Javier Guerra <javier@xxxxxxxxxxx> |
| Date: | Wed, 4 Mar 2009 09:03:41 -0500 |
| Cc: | xen-users@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 04 Mar 2009 06:04:25 -0800 |
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some points to remember: - sar doesn't know a bit about virtualization, therefore all its measures are relative to the resources available to that VM - Dom0 is also a VM managed by the underlying Xen hypervisor, so DomU's CPU time is used 'from outside' Dom0, it doesn't appear in Dom0's sar reports. - all IO pass through Dom0 userspace (except for PCI passthrough), so DomU's IO does appear in Dom0's sar reports. -- Javier _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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