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Re: [Xen-devel] How expensive is a VM EXIT?
| To: | Emre Can Sezer <ecsezer@xxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] How expensive is a VM EXIT? |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 03 Mar 2009 16:34:01 +0000 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 03 Mar 2009 08:35:35 -0800 |
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| Thread-topic: | [Xen-devel] How expensive is a VM EXIT? |
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For just the VMEXIT itself, it's probably about 1000-1500 cycles on the latest processors. I haven't measured it very recently though. -- Keir On 03/03/2009 15:35, "Emre Can Sezer" <ecsezer@xxxxxxxx> wrote: > Hi, > > I've been trying to get a ballpark number on how expensive a VM EXIT is > in terms of clock cycles. I'm also interested in how slow a TLB miss is. > The only reference I was able to find was 13000 cycles for VM EXIT and > around several hundred cycles for a TLB miss and a complete walk of page > tables. Does anyone know from the top of their head or is there a > reference you can share? > > Thanks in advance. > > John > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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