On Fri, Mar 03, 2017 at 10:05:06AM -0700, Thomas Fjellstrom wrote: > I've been testing a new samsung 960 evo nvme drive i just got, and running > tests on it in a guest shows a minimum of double the cpu time on the host as > it does on the guest. Somehow a guest running a single thread iozone or fio > test can use 4+ cores on the host side at 50-100%. Are you using -drive aio=native? Are you pinning threads on the host? If the answer to both questions is no, then QEMU uses a thread pool for disk I/O and those threads could be scheduled on any host CPU. Stefan
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