On 2016-10-06 00:48, Ian Collins 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.
This which version works/is best used to come up a lot.
A while ago most seem to be in agreement which was the best set. I
managed to find it and also host it on my package repository site to not
have it go lost:
http://pkg.blackdot.be/extras/virtio-win-0.1-49.iso
Not sure this is the same version as you mention but I had decent
results on windows 7 and 2008 R2 (didn't have access to newer stuff)
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,
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