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[Xen-devel] CAP and performance problem

  • To: xen-devel@xxxxxxxxxxxxx
  • From: Massimo Canonico <mex@xxxxxxxxxxxx>
  • Date: Tue, 21 May 2013 11:02:42 +0200
  • Delivery-date: Tue, 21 May 2013 09:03:30 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

I sent the following problem on xen-user ML without an answer. I hope I'll get one in this ML.

My application is written in std C++ and it makes a matrix multiplication: so it uses only CPU and memory (no I/O, no network).

I'm quite surprise that with CAP = 100% I got my results in about 600 seconds and with CAP = 50% I got my results in about 1800 seconds (around 3 times longer).

For this kind of application I was expecting to get results in about 1200 seconds (2 times longer) for the second scenario with respect to the first one.

Of course, the HW and SW are exactly the same for the 2 experiments.

Am I wrong or the CAP mechanism is not working well?


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