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Re: [Xen-devel] How expensive is a VM EXIT?
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] How expensive is a VM EXIT? |
| From: | NAHieu <nahieu@xxxxxxxxx> |
| Date: | Wed, 4 Mar 2009 09:15:02 +0900 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 03 Mar 2009 16:15:36 -0800 |
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On Wed, Mar 4, 2009 at 1:34 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote: > For just the VMEXIT itself, it's probably about 1000-1500 cycles on the > latest processors. I haven't measured it very recently though. > Could you explain how do you measure the cycles for VMEXIT? Thanks, H > -- Keir > - Show quoted text - > 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 > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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