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[Xen-users] tsc problems under 3.[12].x


  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Tue, 19 Aug 2008 22:15:56 +1000
  • Delivery-date: Tue, 19 Aug 2008 05:16:36 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AckB9VUV5fPwROymRWK82mqd/mBEAg==
  • Thread-topic: tsc problems under 3.[12].x

I'm seeing lots of problems under Windows which I think are related to
wildly different tsc counters.

Ping gives really strange numbers when vcpus > 1, windows updates
download really slowly (1%/hour with vcpus > 1, 1%/second with vcpus =
1), and anything that reports the tsc shows that it jumps around as it
gets scheduled onto different cpu's.

Is there something I can do about this? Is it a problem with my
hardware? It does it on two completely different servers, although both
use AMD cpu's. Is it fixed in a later version of xen?

Thanks

James

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