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RE: [Xen-devel] Re: [PATCH] CPUIDLE: revise tsc-save/restore to avoid big tsc skew between cpus


  • To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Wei, Gang" <gang.wei@xxxxxxxxx>
  • Date: Sat, 13 Dec 2008 23:27:37 +0800
  • Accept-language: en-US
  • Acceptlanguage: en-US
  • Cc:
  • Delivery-date: Sat, 13 Dec 2008 07:28:07 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AclWoeM2xc+X6mj6QOaQHsyxDmpzagAFRoNpAAEP6tAAAWmCgAAATdDsAAIJ5qAAAvL7GQFMKVOwAA1xISwAJTEgYAANxIuJAAtYh4A=
  • Thread-topic: [Xen-devel] Re: [PATCH] CPUIDLE: revise tsc-save/restore to avoid big tsc skew between cpus

On Saturday, December 13, 2008 5:51 PM, Keir Fraser wrote:
> By the way, c/s 18102 (subsequently reverted) may be interesting for you in
> implementing the TSC-and-no-platform-timer mode. I'm not sure how much of it
> will really be applicable, but it might be worth a look at least.

c/s 18102 looks like a incompleted patch which want to reintroduce TSC as the 
plt only when the tsc is always running & at a constant rate. I guess you still 
want it because TSC access has less cost, right? Anyway, it indeed has less to 
do with my current goal: handling the deepC-stop tsc which runs at constant 
rate.

Jimmy
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