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xen-devel
RE: [Xen-devel] [RFC] Physical hot-add cpus and TSC
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To: |
"Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Xen-Devel (xen-devel@xxxxxxxxxxxxxxxxxxx)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] [RFC] Physical hot-add cpus and TSC |
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From: |
"Dong, Eddie" <eddie.dong@xxxxxxxxx> |
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Date: |
Thu, 10 Jun 2010 14:55:28 +0800 |
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"Dong, Eddie" <eddie.dong@xxxxxxxxx> |
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Wed, 09 Jun 2010 23:59:58 -0700 |
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Thread-topic: |
[Xen-devel] [RFC] Physical hot-add cpus and TSC |
> Below is test result:
> a) With the patch
> Before hotadd:
> (XEN) TSC marked as reliable, warp = 0 (count=3)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 0 (count=4)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 0 (count=5)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 0 (count=6)
> (XEN) No domains have emulated TSC
>
> After add
> (XEN) TSC marked as reliable, warp = 1669912421214 (count=15)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 1669912421214 (count=16)
> (XEN) No domains have emulated TSC
>
If the warp is fixed, at least for HVM, this can be solved by adjusting the
TSC_OFFSET with the additional warp to make guest see warp=0 for TSC invariant
case. Anything missed?
Thx, Eddie
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