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[Xen-devel] Windows SMP

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Venefax" <venefax@xxxxxxxxx>
  • Date: Sat, 27 Dec 2008 22:01:29 -0500
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I think that we need to tackle the absurd loss of performance that any Windows HVM incurs with more than one processor. I have measured it and it is amazing. I have an application that opens 15 independent network clients, and with one single processor and the Standard PC Hal, it takes a little over a minute to load the 15 clients and also to register with the SIP provider. If I leave that unchanged, I mean “ceteris paribus” , and only change the HAL to ACPI and add 8 processors, then the same operation takes over 10 minutes. Hello!!! I am using the GPLVL drivers from James Harper. Right now I am about to test the MPS –Non-ACPI HAL, but the driver still create a BSOD. Maybe the problem is only ACPI, and not MPS, who knows. In any case, what can we do so any Windows virtual machine can achieve a “normal” performance, I mean, a linear performance when using more processors and not this declining curve that can kill any host.



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