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[Xen-ia64-devel] RE: Timer merge

from [Dong, Eddie] [Permanent Link][Original]
To: "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>
Subject: [Xen-ia64-devel] RE: Timer merge
From: "Dong, Eddie" <eddie.dong@xxxxxxxxx>
Date: Mon, 29 Aug 2005 10:29:59 +0800
Cc: "Mallick, Asit K" <asit.k.mallick@xxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: Timer merge 
Dan:
        Thanks, we will send out a patch soon for review with 1: guest
ITC (delta) /ITM keep in shared page, 2: fast hypercall for TPR,EOI,
IVR, 3: ac_timer own machine ITM, 4: short route for guest to set ITM.
        Eddie.


> 
> So Xen/x86 delivers every timer tick to every Linux domain?
> That seems like a potential performance problem!
Yes, the overhead spent on IA32 timer is much higher than IA64. 
Perhaps Linux tickless patch is a better solution.



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