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From: | Alexander Graf |
Subject: | [Qemu-devel] Re: [RFC] allow multi-core guests: introduce cores= option to -cpu |
Date: | Sun, 5 Jul 2009 15:23:27 +0200 |
On 04.07.2009, at 17:25, Avi Kivity wrote:
On 07/03/2009 05:41 PM, Andre Przywara wrote:Hi,currently SMP guests happen to see<n> vCPUs as<n> different sockets. Some guests (Windows comes to mind) have license restrictions and refuseto run on multi-socket machines.So lets introduce a "cores=" parameter to the -cpu option to let the userspecify the number of _cores_ the guest should see.This patch has not been tested with all corner cases, so I just want tohear your comments whether a) we need such an option and b) you like this particular approach.Applying this qemu.git patch to qemu-kvm.git fixes Windows SMP boot on some versions, I successfully tried up to -smp 16 -cpu host,cores=8 withWindowsXP Pro.I thought of using -smp [processors=]2,cores=4,threads=2 (for a total of 16 threads), but I think it makes more sense with -cpu.
I actually think putting this in -smp makes more sense. -cpu really shouldn't need to be touched by normal users and as long as you can either -cpu host or -cpu safe that should be enough.
But then again maybe we should replace -smp with something more useful like -numa where you'd then specify #CPUs, #cores, mem-cpu connection, etc.
Alex
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