On 10/ 6/16 01:35 PM, Ian Collins wrote:
On 10/ 6/16 12:24 PM, Matthew Parsons wrote:
Oh wow, I meant what version of Windows guests! (As you might expect, guest behavior can be rather different between, say, 2003 vs 2012 R2.)

It's 2012 R2.

Quick google shows that version probably came from https://download.joyent.com/pub/vmtools/, so hopefully you're runing 2012 :) - It's been a fair few months since I've had to deal w/ Windows under KVM, and it sounds like I don't know anything you don't - but just in case, I'd start at https://fedoraproject.org/wiki/Windows_Virtio_Drivers and try updating w/ the latest there.

I've just migrated the machine back to a single core test host and it is now using 39% of the host CPU, so that blows the lots of cores hypothesis. Another 2012R2 guest on the same host is idling at 4%, so there's something going on the the VM.

Yep, I should have known: it was a (spit) java service...

--
Ian.




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