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xen-devel
Re: [Xen-devel] Windows SMP
It seems something wrong. It is hard to achieve linear performance with more processors, but it should be at least something "normal". Another choice might be halsign turbogate drivers. I used it half a year ago, and it is stable and performance is really nice.
2008/12/27 Venefax <venefax@xxxxxxxxx>
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.
Federico
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