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.)
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. (http://www.linux-kvm.org/page/WindowsGuestDrivers/Download_Drivers - for more info) On Wed, Oct 5, 2016 at 3:48 PM, Ian Collins <[email protected]> wrote: > On 10/ 6/16 10:03 AM, Matthew Parsons wrote: > >> Have you installed the VirtIO drivers in windows? (And what version?) For >> testing I'd try disabling/removing the guest NICs and just see if >> interrupts die down. >> > > Which version is often an issue! There are so many out there and some > work with one version of windows and not another! The ISO I use is named > "me-ws2012std-20130712.iso" and I've been using it for a couple of years so > its origins are lost in the mists of time. > > Also (again for testing) perhaps reduce cores to the amount on a physical >> CPU socket and assign/restrict to avoid crossing NUMA boundries. >> > > The problem only becomes an issue when the core number gets high, as I > said in my original post the load average almost quadruples when going from > 16 to 32 cores. > > (I trust that whatever workload you're running benefits from that many >> cores, but typically I'd keep 2 or so for the hypervisor/management/other.) >> > > The workload is compiling a large C and C++ code base, so the more cores > the better. > > Experimenting on a smaller machine shows the build times to cores ratios > reflect those on bare metal, that is if I give the VM the full system > picture (using qemu_extra_opts) build times are about 25% faster than > giving it the number of physical cores (using vcpus). For example to get > optimum performance on a single quad core, use "vcpus": 1, > "qemu_extra_opts": "-smp cpus=1,cores=4,threads=2". > > Cheers, > > -- > Ian. > ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
