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[Xen-users] Timer and dynamic tick

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Marco Tizzoni <marco.tizzoni@xxxxxxxxx>
  • Date: Thu, 10 Dec 2009 12:34:04 +0100
  • Delivery-date: Thu, 10 Dec 2009 03:35:08 -0800
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>
Hello,
I'd understand if setting CONFIG_NO_HZ=y in dom0/domU is required/suggested.

Because Xen supports no-tick-on-idle mechanism (http://virt.kernelnewbies.org/ParavirtBenefits#head-360a0849a0639297396542dddcc691e4100287ab) ticks come from the hypervisor only when needed by the guest so, in my understanding, setting CONFIG_NO_HZ=n will make no difference. Any comments?

Regards,
Marco
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