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[Xen-ia64-devel] RE: Timer merge

  • To: "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>
  • 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
  • Delivery-date: Mon, 29 Aug 2005 02:27:58 +0000
  • List-id: Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>
  • Thread-index: AcWnjSOhSjX2nMKXQI2EGFjNgzyS+AAXrvdAAAAqXDAAAf54IAAFcXoAAATDFSAAADCbAAAOO83gAB29uYAAKFIVoAACuHFQACBS1PAAD2rcAACBlABQ
  • 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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